cryoamp FQ1, Voltage measurement, ac ultralownoise
5kHz to 80MHz battery-operated with room-temperature fiber-isolated readout.
Input resistance is 10kohm, inputcapacitance is 2pF. Output resistance can be tuned remotely to 50 ohm.
Noise is 0.3nV/sqrtHz (>1MHz)
Power in the cryoamp circuit can be remotely tuned to <100uW
The amplifier and bias contain no chopper or oscillating circuits that could produce interference
