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(a) Circuit diagram of a two-stage amplifier based on such CMOS inverters and (b) conventional ac-flux modulated SQUID readout.
Typical gains and their frequency dependence for a three-stage amplifier based on a HEF 4069UB device. The supply voltage was . The rolloff toward lower frequencies is due to capacitive coupling between the amplifier stages.
Voltage noise of an amplifier based on CMOS inverters as a function of frequency for four different temperatures. The supply voltage was .
(a) Simple phase-sensitive detector based on an anaolg switch which is switched on for half of the reference cycle, and switched off for the other half. (b) Phase-sensitive detector consisting of two MOSFETs connected in series to form an analog multiplier. The gain of this multiplier is changed periodically by the reference signal, and the output of the multiplier contains the product of input signal and reference signal. (c) Circuit diagram of an integrator based on a CMOS inverter.
Circuit diagram of a prototype of a cold SQUID readout circuit (less reference oscillator, which is at room temperature).
Flux noise spectrum of a SQUID read out by the cold SQUID readout circuit.
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