Abstract
To realize a multipixel camera for astronomical observation, we developed cryogenic multi-channel readout systems using gallium arsenide junction field-effect transistor (GaAs JFET) integrated circuits (ICs). Based on our experience with these cryogenic ICs, we designed, manufactured, and demonstrated operational amplifiers requiring four power supplies and two voltage sources. The amplifiers operate at 4.2K with an open-loop gain of 2000. The gain–bandwidth product can expect 400kHz at a power dissipation of 6μW. In performance evaluations, the input-referred voltage noise was 4μVrms/Hz0.5 at 1Hz and 30nVrms/Hz0.5 at 10kHz, respectively. The noise power spectrum density was of type 1/f and extended to 10kHz.
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