{"id":30,"date":"2019-04-19T12:50:34","date_gmt":"2019-04-19T12:50:34","guid":{"rendered":"http:\/\/cryohemt.com\/?page_id=30"},"modified":"2021-05-07T15:35:27","modified_gmt":"2021-05-07T15:35:27","slug":"products","status":"publish","type":"page","link":"https:\/\/cryohemt.com\/index.php\/products\/","title":{"rendered":"Products"},"content":{"rendered":"\n<ul><li>CryoHEMTs: chip or packaged in ceramic SOT23<\/li><li>CryoHEMTs based cryogenic preamplifiers<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>CryoHEMTs: chip or packaged in ceramic SOT23<\/strong> <\/h2>\n\n\n\n<p>Characteristics of available cryoHEMTs with various gate-surface measured at 4.2 K, <em>I<\/em><sub>ds<\/sub>&nbsp;= 1 mA and&nbsp;<em>V<\/em><sub>ds<\/sub>&nbsp;= 100 mV:<\/p>\n\n\n\n<style>\n        #menu-item-30>a {\n        color: #13aff0 !important;\n        }\n.is-style-stripes.small-table {\nline-height: 24px;\nwidth: 550px !important;\nmargin-top: 0 !important;\n}\n.is-style-stripes.small-table td {\n    display: table-cell;\n    vertical-align: middle;\n}\n.asterisk-p {\nmargin-bottom: 0px;\n}\n.a5-1-publications-list li {\n        line-height: 20px;\n        margin-bottom: 5px;\n        list-style-type: none;\n    }\ntd {\n    white-space: nowrap;\n}\n<\/style>\n\n\n\n<div class=\"wp-block-columns has-2-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis: 80%;overflow-y: auto;\">\n    <table class=\"wp-block-table is-style-stripes\">\n        <tbody>\n            <tr>\n                <td colspan=\"2\">Denomination<\/td>\n                <td>200pch<\/td>\n                <td>100pch<\/td>\n                <td>30pch<\/td>\n                <td>5pch<\/td>\n                <td>1pch<\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>L<\/em><sub>g<\/sub>x<em>W<\/em> (\u00b5m\u00b2)<\/td>\n                <td> 1.5\u00d710<sup>5<\/sup> <\/td>\n                <td>6.4\u00d710<sup>4<\/sup> <\/td>\n                <td> 2.0\u00d710<sup>4<\/sup> <\/td>\n                <td>2.0\u00d710<sup>3<\/sup> <\/td>\n                <td>4.0\u00d710<sup>2<\/sup> <\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>C<\/em><sub>gs <\/sub>(pF); <em>C<\/em><sub>gd <\/sub>(pF) <\/td>\n                <td>236; 8.9 <\/td>\n                <td>103; 8.9 <\/td>\n                <td>33; 3.5 <\/td>\n                <td>4.6; 1.0 <\/td>\n                <td>1.8; ~0.6 <\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>V<\/em><sub>ds<\/sub>(mV); <em>I<\/em><sub>ds<\/sub>(mA) <\/td>\n                <td>100; 1.0 <\/td>\n                <td>100; 1.0<\/td>\n                <td>100; 1.0 <\/td>\n                <td>100; 1.0 <\/td>\n                <td>100; 0.5<\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>g<\/em><sub>m<\/sub> (mS); <em>g<\/em><sub>d<\/sub> (mS)<\/td>\n                <td>52; 0.4<\/td>\n                <td>40; 1.2<\/td>\n                <td>115; 1.3<\/td>\n                <td>44; 1.3<\/td>\n                <td>15; 0.8<\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>f<\/em><sub>t<\/sub> = <em>g<\/em><sub>m<\/sub>\/(2\u03c0<em>C<\/em><sub>gs<\/sub>) (Hz)<\/td>\n                <td>3.5\u00d710<sup>7<\/sup><\/td>\n                <td>6.2\u00d710<sup>7<\/sup><\/td>\n                <td>5.5\u00d710<sup>8<\/sup><\/td>\n                <td>1.5\u00d710<sup>9<\/sup><\/td>\n                <td>1.3\u00d710<sup>9<\/sup><\/td>\n            <\/tr>\n            <tr>\n                <td style=\"vertical-align: middle; padding-right: 0;\"><em>e<\/em><sub>n<\/sub> (nV\/Hz<sup>\u00bd<\/sup>) <\/td>\n                <td style=\"text-align: left;padding: 0;\">@1Hz<br>@10Hz<br>@100Hz<br>@1kHz<\/td>\n               <td>~&nbsp;5.4<br>~&nbsp;1.8<br>~&nbsp;0.55<br>~&nbsp;0.25<\/td>\n<td>11&nbsp;&#8211;&nbsp;14<br>4&nbsp;&#8211;&nbsp;5<br>~&nbsp;1<br>~&nbsp;0.4<\/td>\n<td>~ 15<br>~ 5.5<br>1.5&nbsp;&#8211;&nbsp;2<br>0.6&nbsp;&#8211;&nbsp;0.7 <\/td>\n<td>35&nbsp;&#8211;&nbsp;50<br>10&nbsp;&#8211;&nbsp;15<br>2.5&nbsp;&#8211;&nbsp;5<br>0.75&nbsp;&#8211;&nbsp;1.2<\/td>\n<td>80&nbsp;&#8211;&nbsp;100<br>30&nbsp;&#8211;&nbsp;40<br>8&nbsp;&#8211;&nbsp;10<br>2&nbsp;&#8211;&nbsp;4<\/td>\n            <\/tr>\n            <tr>\n                <td colspan=\"2\"><em>e<\/em><sub>n-white<\/sub> (nV\/Hz<sup>\u00bd<\/sup>)<\/td>\n                <td>~&nbsp;0.18<\/td>\n                <td>~&nbsp;0.21<\/td>\n                <td>0.15&nbsp;&#8211;&nbsp;0.18<\/td>\n                <td>~&nbsp;0.24<\/td>\n                <td>0.4&nbsp;&#8211;&nbsp;0.5<\/td>\n            <\/tr>\n            <tr>\n                <td style=\"vertical-align: middle; padding-right: 0;\"> <em>i<\/em><sub>n<\/sub> (aA\/Hz<sup>\u00bd<\/sup>)<\/td>\n                <td style=\"text-align: left;padding: 0;\">@1Hz<br>@1kHz <\/td>\n                <td>21<br>6.8\u00d710<sup>2<\/sup><\/td>\n                <td>15<br>5.1\u00d710<sup>2<\/sup><\/td>\n                <td>9.1<br>2.4\u00d710<sup>2<\/sup><\/td>\n                <td>2.2<br>70<\/td>\n                <td>3.6<br>57<\/td>\n            <\/tr>\n        <\/tbody>\n    <\/table>\n<\/div>\n    <div class=\"wp-block-column\" style=\"flex-basis: 20%\">\n        <div class=\"wp-block-image\">\n            <figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"113\" src=\"http:\/\/cryohemt.com\/wp-content\/uploads\/2019\/04\/cryoHEMT-chip.jpg\" alt=\"\" class=\"wp-image-35\">\n                <figcaption><strong>cryoHEMT chip<\/strong><\/figcaption>\n            <\/figure>\n        <\/div>\n        <div class=\"wp-block-image\">\n            <figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"112\" src=\"http:\/\/cryohemt.com\/wp-content\/uploads\/2019\/04\/cryoHEMT-ceramic-SOT23-e1620399616728.jpg\" alt=\"\" class=\"wp-image-34\">\n                <figcaption><strong>cryoHEMT in ceramic SOT23<\/strong><\/figcaption>\n            <\/figure>\n        <\/div>\n    <\/div>\n<\/div>\n\n\n\n<p><em>L<\/em><sub>g<\/sub>x<em>W<\/em> is the gate surface; <em>C<\/em><sub>gs<\/sub>,\nthe gate-source capacitance; <em>C<\/em><sub>gd<\/sub>, the gate-drain capacitance; <em>V<\/em><sub>ds<\/sub><sub>,<\/sub>\nthe drain-source bias; <em>I<\/em><sub>ds,<\/sub> the drain-source current; <em>g<\/em><sub>m,<\/sub>\nthe transconductance; <em>g<\/em><sub>d<\/sub><sub>,<\/sub> the output conductance; <em>f<\/em><sub>t<\/sub>,\nthe current-gain cutoff frequency;&nbsp; <em>e<\/em><sub>n<\/sub>,\nthe equivalent input noise voltage; <em>e<\/em><sub>n<\/sub><sub>-white<\/sub>, the equivalent input white noise\nvoltage; <em>i<\/em><sub>n<\/sub>,\nthe equivalent input noise current. Noise current is measured with the help of\nthe capacitance input setup shown in the reference <em>Appl. Phys. Lett.<\/em> <strong>105<\/strong>, 13504 (2014).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>CryoHEMTs based cryogenic preamplifiers <\/strong><\/h2>\n\n\n\n<p>Various cryogenic readout electronics have been realized with cryoHEMTs and performed (see papers in \u201cPUBLICATIONS\u201d), a few examples are as below. We can propose and provide several types of cryo-amp to meet specific experimental requirement, e.g., set the output impedance of 50\u03a9 for operating frequency \u00bb 1 MHz; minimize the Miller effect and the input capacitance by adding a follower (common-drain amp). All our cryo-amps can be modified and optimized to fit user\u2019s needs.<\/p>\n\n\n\n<p>Datasheet of following plug-and-play cryo-amps are biased with two votage sources. The cryo-amps can also be biased with only one voltage source, but the datasheet can be changed, e.g., the low-frequency limit and the power dissipation. The box dimension (without SMA and feedthrough) of the cryo-amps is 36mmX26mmX8mm.<\/p>\n\n\n\n<div class=\"wp-block-columns has-2-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image\"><figure class=\"alignright is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-1.jpg\" alt=\"\" class=\"wp-image-291\" width=\"270\" height=\"194\" srcset=\"https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-1.jpg 869w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-1-300x216.jpg 300w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-1-768x552.jpg 768w\" sizes=\"(max-width: 270px) 100vw, 270px\" \/><\/figure><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image\"><figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2.jpg\" alt=\"\" class=\"wp-image-292\" width=\"291\" height=\"195\" srcset=\"https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2.jpg 615w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2-300x201.jpg 300w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2-570x380.jpg 570w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2-380x254.jpg 380w, https:\/\/cryohemt.com\/wp-content\/uploads\/2020\/11\/cryohemt-2-285x190.jpg 285w\" sizes=\"(max-width: 291px) 100vw, 291px\" \/><\/figure><\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size\">The cryo-amp A5-1 is based on a 5pch with the DC coupling input: datasheet and some of resulted publications:<\/p>\n\n\n\n<div class=\"wp-block-columns has-2-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<table class=\"wp-block-table aligncenter is-style-stripes small-table\"><tbody><tr><td> Model: A5-1 <\/td><td>5pch cryoHEMT<\/td><\/tr><tr><td>Operating temperature<\/td><td> \u2264 4.2 K <\/td><\/tr><tr><td> Input coupling <\/td><td>DC<\/td><\/tr><tr><td> Input impedance <\/td><td> 11 pF \/\/ 10<sup>16<\/sup> \u03a9 <\/td><\/tr><tr><td>Output coupling<\/td><td>DC<\/td><\/tr><tr><td>Output impedance<\/td><td> 132 \u03a9 <\/td><\/tr><tr><td> *Bandwidth, including the input<br>impedance of 50 \u03a9, the power <br>lines\u2019 resistance of 1 \u03a9 and the <br>output cable\u2019s capacitance of 200 pF <\/td><td> 0 Hz \u2013 6 MHz<br><\/td><\/tr><tr><td> **Voltage gain <em>A<\/em><sub>vo<\/sub> <\/td><td> ~ 5 <\/td><\/tr><tr><td> ***<em>V<\/em><sub>out_p-t-p<\/sub> = 90 mV<em> <\/em> <\/td><td> A<sub>v<\/sub>\/<em>A<\/em><sub>vo<\/sub> = 95% <\/td><\/tr><tr><td> Power dissipation <\/td><td> ~ 0.35 mW <\/td><\/tr><tr><td> HEMT\u2019s<br>Noise voltages @ 4.2 K <\/td><td> 9.8 ~ 12 nV\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.66 ~ 0.93 nV\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.25 nV\/Hz<sup>\u00bd<\/sup> at 100 kHz<br>0.24 nV\/Hz<sup>\u00bd<\/sup> at 1 MHz <\/td><\/tr><tr><td> **** HEMT\u2019s<br>Noise currents @ 4.2 K <\/td><td> 6 aA\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>62 aA\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.7 fA\/Hz<sup>\u00bd<\/sup> at 100 kHz<br>2 fA\/Hz<sup>\u00bd<\/sup> at 1 MHz <\/td><\/tr><\/tbody><\/table>\n\n\n\n<p style=\"font-size:11px\" class=\"asterisk-p\">* The high frequency limit partially depends on amp\u2019s output impedance and the capacitance of the cable that connects the cryo-amp to the room temperature electronics. By setting 50 \u03a9 output, the cutoff frequency can be about 420 MHz.  ** <em>A<\/em><sub>vo<\/sub> is the small signal voltage gain.&nbsp; <em>A<\/em><sub>vo<\/sub> can be increased (or decreased) by increasing (or decreasing) the output impedance, the change of the output impedance induces the change of the power dissipation and the high-frequency limit of the cryo-amp.  *** The voltage gain <em>A<\/em><sub>v<\/sub> depends on its output peak-to-peak amplitude <em>V<\/em><sub>out_p-t-p<\/sub>, <em>A<\/em><sub>v<\/sub> decreases with the increase of <em>V<\/em><sub>out_p-t-p<\/sub> due to the limit of the working point.**** The noise current is measured in a HEMT with the same configuration by the capacitor input method, see <a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1063\/1.4887368\" target=\"_blank\"><em>Applied Physics Letters<\/em> 105, 1, 013504 (2014)<\/a>  <\/p>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<ul class=\"a5-1-publications-list\">\n        <li><em>Quantum limit of heat flow across a single electronic channel<\/em><br>  <a target=\"_blank\" href=\"http:\/\/science.sciencemag.org\/content\/342\/6158\/601\">Science\n                342, 601 (2013)<\/a><\/li>\n        <li><em>Hong-Ou-Mandel experiment for temporal investigation of single electron fractionalization<br> <\/em> <a target=\"_blank\" href=\"https:\/\/www.nature.com\/articles\/ncomms7854\">Nature\n                Communications 6, 6854 (2015)<\/a><\/li>\n        <li><em>Primary thermometry triad at 6 mK in mesoscopic circuits<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1038\/ncomms12908\">Nature\n                Communications 7, 12908 (2016)<\/a><\/li>\n        <li><em>Heat Coulomb blockade of one ballistic channel<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1038\/nphys4280\">Nature\n                Physics 14(2), 145-148 (2018)<\/a><\/li>\n        <li><em>Charge trapping and super-Poissonian noise centres in a cuprate superconductor<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1038\/s41567-018-0300-z\">Nature\n                Physics, 14, 1183 (2018)<\/a><\/li>\n        <li><em>Noisy defects in the high-Tc superconductor Bi<sub>2<\/sub>Sr<sub>2<\/sub>CaCu<sub>2<\/sub>O<sub>8+x<\/sub><br><\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1038\/s41467-019-08518-1\">Nature Communications 10, 544 (2019)<\/a><\/li>\n        <li><em>Atomic scale shot-noise using cryogenic MHz circuitry<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1063\/1.5043261\">Review\n                of Scientific Instruments 89, 093708 (2018)<\/a><\/li>\n        <li><em>Amplifier for scanning tunneling microscopy at MHz frequencies<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1063\/1.5043267\">Review\n                of Scientific Instruments 89, 093709 (2018)<\/a><\/li>\n<li><em>Atomic manipulation of the gap in Bi2Sr2CaCu2O8+x<br> <\/em> <a target=\"_blank\" href=\"https:\/\/science.sciencemag.org\/content\/suppl\/2019\/12\/30\/367.6473.68.DC1\">Science 367, 6473, 68 (Supplementary Materials) (2020)<\/a><\/li>\n        <li><em>Improving the read-out of the resonance frequency of nanotube mechanical resonators<br> <\/em> <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1063\/1.5045309\">Applied\n                Physics Letters 113, 063104 (2018)<\/a><\/li>\n<li><em>Ultrasensitive displacement noise measurement of carbon nanotube mechanical resonators<br> <\/em> <a target=\"_blank\" href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.nanolett.8b02437\">Nano\n                Letters 18, 5324 (2018)<\/a><\/li>\n<li><em>Cooling and self-oscillation in a nanotube electromechanical resonator<br> <\/em> <a target=\"_blank\" href=\"https:\/\/www.nature.com\/articles\/s41567-019-0682-6\">          Nature Physics 16, 32 (2020)<\/a><\/li>\n<li><em>Fractional statistics in anyon collisions<br> <\/em> <a target=\"_blank\" href=\"https:\/\/science.sciencemag.org\/content\/368\/6487\/173\">Science 368, 6487, 173-177 (2020)<\/a><\/li>\n    <\/ul>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size\">The cryo-amp A5ac-1 is based on a 5pch with the AC coupling input: datasheet<\/p>\n\n\n\n<div class=\"wp-block-columns has-2-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<table class=\"wp-block-table aligncenter is-style-stripes small-table\"><tbody><tr><td> Amp model: A5ac-1 <\/td><td>5pch cryoHEMT<\/td><\/tr><tr><td>Operating temperature<\/td><td> \u2264 4.2 K <\/td><\/tr><tr><td> Input coupling <\/td><td>AC<\/td><\/tr><tr><td> Input impedance <\/td><td> 11 pF \/\/ 1.3 G\u03a9 <\/td><\/tr><tr><td>Output coupling<\/td><td>DC<\/td><\/tr><tr><td>Output impedance<\/td><td> 132 \u03a9 <\/td><\/tr><tr><td>*Bandwidth, including the input<br>impedance of 50 \u03a9, the power <br>lines\u2019 resistance of 1 \u03a9 and the <br>output cable\u2019s capacitance of 200 pF <\/td><td> 12 mHz \u2013 6 MHz<br><\/td><\/tr><tr><td> **Voltage gain <em>A<\/em><sub>vo<\/sub> <\/td><td> ~ 5 <\/td><\/tr><tr><td> ***<em>V<\/em><sub>out_p-t-p<\/sub> = 90 mV<em> <\/em> <\/td><td> A<sub>v<\/sub>\/<em>A<\/em><sub>vo<\/sub> = 95% <\/td><\/tr><tr><td> Power dissipation <\/td><td> ~ 0.35 mW <\/td><\/tr><tr><td> HEMT\u2019s<br>Noise voltages @ 4.2 K <\/td><td> 9.8 ~ 12 nV\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.66 ~ 0.93 nV\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.25 nV\/Hz<sup>\u00bd<\/sup> at 100 kHz<br>0.24 nV\/Hz<sup>\u00bd<\/sup> at 1 MHz <\/td><\/tr><tr><td> **** HEMT\u2019s<br>Noise currents @ 4.2 K <\/td><td> 6 aA\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>62 aA\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.7 fA\/Hz<sup>\u00bd<\/sup> at 100 kHz<br>2 fA\/Hz<sup>\u00bd<\/sup> at 1 MHz <\/td><\/tr><\/tbody><\/table>\n\n\n\n<p style=\"font-size:11px\" class=\"asterisk-p\"> * The high frequency limit partially depends on amp\u2019s output impedance and the capacitance of the cable that connects the cryo-amp to the room temperature electronics. By setting 50 \u03a9 output, the cutoff frequency can be about 420 MHz.  ** <em>A<\/em><sub>vo<\/sub> is the small signal voltage gain.&nbsp; <em>A<\/em><sub>vo<\/sub> can be increased (or decreased) by increasing (or decreasing) the output impedance, the change of the output impedance induces the change of the power dissipation and the high-frequency limit of the cryo-amp.  *** The voltage gain <em>A<\/em><sub>v<\/sub> depends on its output peak-to-peak amplitude <em>V<\/em><sub>out_p-t-p<\/sub>, <em>A<\/em><sub>v<\/sub> decreases with the increase of <em>V<\/em><sub>out_p-t-p<\/sub> due to the limit of the working point.**** The noise current is measured in a HEMT with the same configuration by the capacitor input method, see <a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1063\/1.4887368\" target=\"_blank\"><em>Applied Physics Letters<\/em> 105, 1, 013504 (2014)<\/a>   <\/p>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size\">The cryo-amp A200-1 is based on a 200pch with the DC coupling input: datasheet<\/p>\n\n\n\n<div class=\"wp-block-columns has-2-columns is-layout-flex wp-container-core-columns-is-layout-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<table class=\"wp-block-table aligncenter is-style-stripes small-table\"><tbody><tr><td> Amp model: A200-1 <\/td><td>200pch cryoHEMT<\/td><\/tr><tr><td>Operating temperature<\/td><td> \u2264 4.2 K <\/td><\/tr><tr><td> Input coupling <\/td><td>DC<\/td><\/tr><tr><td> Input impedance <\/td><td> 266 pF \/\/ 10<sup>16<\/sup> \u03a9<\/td><\/tr><tr><td>Output coupling<\/td><td>DC<\/td><\/tr><tr><td>Output impedance<\/td><td> 106 \u03a9 <\/td><\/tr><tr><td> *Bandwidth, including the input<br>impedance of 50 \u03a9, the power <br>lines\u2019 resistance of 1 \u03a9 and the <br>output cable\u2019s capacitance of 200 pF <\/td><td> 0 Hz \u2013 5.7 MHz<br><\/td><\/tr><tr><td> **Voltage gain <em>A<\/em><sub>vo<\/sub> <\/td><td> ~ 5 <\/td><\/tr><tr><td> ***<em>V<\/em><sub>out_p-t-p<\/sub> = 90 mV<em> <\/em> <\/td><td> A<sub>v<\/sub>\/<em>A<\/em><sub>vo<\/sub> = 95% <\/td><\/tr><tr><td> Power dissipation <\/td><td> ~ 0.3 mW <\/td><\/tr><tr><td> HEMT\u2019s<br>Noise voltages @ 4.2 K <\/td><td> 2 nV\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.54 nV\/Hz<sup>\u00bd<\/sup> at 100 Hz<br>0.24 nV\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.19 nV\/Hz<sup>\u00bd<\/sup> at 10 kHz<br>0.18 nV\/Hz<sup>\u00bd<\/sup> at 100 kHz  <\/td><\/tr><tr><td> **** HEMT\u2019s<br>Noise currents @ 4.2 K <\/td><td>  70 aA\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.21 fA\/Hz<sup>\u00bd<\/sup> at 100 Hz<br>0.68 fA\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>2.1 fA\/Hz<sup>\u00bd<\/sup> at 10 kHz<br>6.0 fA\/Hz<sup>\u00bd<\/sup> at 100 kHz <\/td><\/tr><\/tbody><\/table>\n\n\n\n<p style=\"font-size:10px\" class=\"asterisk-p\"> * The high frequency limit partially depends on amp\u2019s output impedance and the capacitance of the cable that connects the cryo-amp to the room temperature electronics. By setting 50 \u03a9 output, the cutoff frequency can be about 420 MHz.  ** <em>A<\/em><sub>vo<\/sub> is the small signal voltage gain.&nbsp; <em>A<\/em><sub>vo<\/sub> can be increased (or decreased) by increasing (or decreasing) the output impedance, the change of the output impedance induces the change of the power dissipation and the high-frequency limit of the cryo-amp.  *** The voltage gain <em>A<\/em><sub>v<\/sub> depends on its output peak-to-peak amplitude <em>V<\/em><sub>out_p-t-p<\/sub>, <em>A<\/em><sub>v<\/sub> decreases with the increase of <em>V<\/em><sub>out_p-t-p<\/sub> due to the limit of the working point.**** The noise current is measured in a HEMT with the same configuration by the capacitor input method, see <a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1063\/1.4887368\" target=\"_blank\"><em>Applied Physics Letters<\/em> 105, 1, 013504 (2014)<\/a>   <\/p>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size\">The cryo-amp A200ac-1 is based on a 200pch with the AC coupling input: datasheet<br><\/p>\n\n\n\n<div class=\"wp-block-columns has-2-columns is-layout-flex wp-container-core-columns-is-layout-5 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<table class=\"wp-block-table aligncenter is-style-stripes small-table\"><tbody><tr><td> Amp model: A200ac-1 <\/td><td>200pch cryoHEMT<\/td><\/tr><tr><td>Operating temperature<\/td><td> \u2264 4.2 K <\/td><\/tr><tr><td> Input coupling <\/td><td>AC<\/td><\/tr><tr><td> Input impedance <\/td><td> 266 pF \/\/ 1.3 G\u03a9<\/td><\/tr><tr><td>Output coupling<\/td><td>DC<\/td><\/tr><tr><td>Output impedance<\/td><td> 106 \u03a9 <\/td><\/tr><tr><td>*Bandwidth, including the input<br>impedance of 50 \u03a9, the power <br>lines\u2019 resistance of 1 \u03a9 and the <br>output cable\u2019s capacitance of 200 pF <\/td><td> 12 mHz \u2013 5.7 MHz<br><\/td><\/tr><tr><td> **Voltage gain <em>A<\/em><sub>vo<\/sub> <\/td><td> ~ 5 <\/td><\/tr><tr><td> ***<em>V<\/em><sub>out_p-t-p<\/sub> = 90 mV<em> <\/em> <\/td><td> A<sub>v<\/sub>\/<em>A<\/em><sub>vo<\/sub> = 95% <\/td><\/tr><tr><td> Power dissipation <\/td><td> ~ 0.3 mW <\/td><\/tr><tr><td> HEMT\u2019s<br>Noise voltages @ 4.2 K <\/td><td> 2 nV\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.54 nV\/Hz<sup>\u00bd<\/sup> at 100 Hz<br>0.24 nV\/Hz<sup>\u00bd<\/sup> at 1 kHz<br>0.19 nV\/Hz<sup>\u00bd<\/sup> at 10 kHz<br>0.18 nV\/Hz<sup>\u00bd<\/sup> at 100 kHz  <\/td><\/tr><tr><td> **** HEMT\u2019s<br>Noise currents @ 4.2 K <\/td><td>  70 aA\/Hz<sup>\u00bd<\/sup> at 10 Hz<br>0.21 fA\/Hz<sup>\u00bd<\/sup> at 100 Hz<br>0.68 fA\/Hz<sup>\u00bd<\/sup> at 1&nbsp;kHz<br>2.1 fA\/Hz<sup>\u00bd<\/sup> at 10&nbsp;kHz<br>6.0 fA\/Hz<sup>\u00bd<\/sup> at 100&nbsp;kHz <\/td><\/tr><\/tbody><\/table>\n\n\n\n<p style=\"font-size:11px\" class=\"asterisk-p\"> * The high frequency limit partially depends on amp\u2019s output impedance and the capacitance of the cable that connects the cryo-amp to the room temperature electronics. By setting 50 \u03a9 output, the cutoff frequency can be about 420 MHz.  ** <em>A<\/em><sub>vo<\/sub> is the small signal voltage gain.&nbsp; <em>A<\/em><sub>vo<\/sub> can be increased (or decreased) by increasing (or decreasing) the output impedance, the change of the output impedance induces the change of the power dissipation and the high-frequency limit of the cryo-amp.  *** The voltage gain <em>A<\/em><sub>v<\/sub> depends on its output peak-to-peak amplitude <em>V<\/em><sub>out_p-t-p<\/sub>, <em>A<\/em><sub>v<\/sub> decreases with the increase of <em>V<\/em><sub>out_p-t-p<\/sub> due to the limit of the working point.**** The noise current is measured in a HEMT with the same configuration by the capacitor input method, see <a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1063\/1.4887368\" target=\"_blank\"><em>Applied Physics Letters<\/em> 105, 1, 013504 (2014)<\/a>   <\/p>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>CryoHEMTs: chip or packaged in ceramic SOT23 CryoHEMTs based cryogenic preamplifiers CryoHEMTs: chip or packaged in ceramic SOT23 Characteristics of available cryoHEMTs with various gate-surface measured at 4.2 K, Ids&nbsp;= 1 mA and&nbsp;Vds&nbsp;= 100 mV: Denomination 200pch 100pch 30pch 5pch 1pch LgxW (\u00b5m\u00b2) 1.5\u00d7105 6.4\u00d7104 2.0\u00d7104 2.0\u00d7103 4.0\u00d7102 Cgs (pF); Cgd (pF) 236; 8.9 103;<span class=\"post-excerpt-end\">&hellip;<\/span><\/p>\n<p class=\"more-link\"><a href=\"https:\/\/cryohemt.com\/index.php\/products\/\" class=\"themebutton\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/pages\/30"}],"collection":[{"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/comments?post=30"}],"version-history":[{"count":57,"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/pages\/30\/revisions"}],"predecessor-version":[{"id":381,"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/pages\/30\/revisions\/381"}],"wp:attachment":[{"href":"https:\/\/cryohemt.com\/index.php\/wp-json\/wp\/v2\/media?parent=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}