The actual sensitivity of a radio frequency SQUID, determined by fluctuations in the electrical degree of freedom and the preamplifier with selection of the working point between neighboring plateaus, is theoretically investigated. A standard method for describing regenerative systems, which operate in a conditionally stable mode, is used to describe the signal and noise characteristics of SQUID in this mode. Formulas are found for calculating the actual sensitivity of a SQUID with amplitude-phase demodulation of the output signal, and a comparison with the traditional "on plateau" mode is performed.
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