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Schema of the low temperature part of the readout circuit.
Transmission vs frequency curves obtained at 0.309 K and with the MSA OFF, for different input flux in the tank circuit SQUID . After the attenuators, the incoming power is −99 dBm.
Transmission vs frequency curves obtained at with a network analyzer at 0.309 K (−99 dBm incoming power) with the MSA ON, i.e., optimally biased to have the largest respectively positive or negative transfer function (upper or lower figure). The voltage across the varactor diode placed at the end of the microstrip is varied. The calibration was performed with the PC board (as illustrated in Fig. 1) replaced by a short transmission line.
Transmitted power vs frequency measured with a spectrum analyzer for a couple of input flux values ( apart) with the MSA OFF or ON with an incoming power of −99 or −90 dBm. Inset: power spectrum at 561 MHz for curves 3 and 4.
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