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A superconducting quantum interference device with differential output or"DSQUID" was proposed earlier for operation in the presence of largecommon-mode signals. The DSQUID is the differential connection of two identicalSQUIDs. Here we show that besides suppression of electromagnetic interferencethis device provides effective linearization of DC SQUID voltage response. Inthe frame of the resistive shunted junction model with zero capacitance, wedemonstrate that Spur-Free Dynamic Range (SFDR) of DSQUID magneticflux-to-voltage transfer function is higher than SFDR > 100 dB while TotalHarmonic Distortion (THD) of a signal is less than THD < $10^{-3}\%$ with apeak-to-peak amplitude of a signal being a quarter of half flux quantum,$2\Phi_a = \Phi_0/8$. Analysis of DSQUID voltage response stability to avariation of the circuit parameters shows that DSQUID implementation allowsdoing highly linear magnetic flux-to-voltage transformation at the cost of ahigh identity of Josephson junctions and high-precision current supply.

A linear magnetic flux-to-voltage transfer function of differential DC SQUID