Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement<xref rid="cpb_27_6_060702_fn1" ref-type="fn">*</xref><fn id="cpb_27_6_060702_fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant No. 11474008), the National Key Research and Development Program of China (Grant No. 2016YFA0300904), and the National Basic Research Program of China (Grant No. 2011CBA00106).</p> </fn>

Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement* *

Project supported by the National Natural Science Foundation of China (Grant No. 11474008), the National Key Research and Development Program of China (Grant No. 2016YFA0300904), and the National Basic Research Program of China (Grant No. 2011CBA00106).

Yang Wuhao^†, Wei Jian

(color online) The frequency dependence of the voltage gain of the cryogenic amplifier into a 50-Ω load, measured for the quiescent operating points at room temperature (red line), liquid nitrogen temperature (green line), and liquid helium temperature (blue line).