A circuit assemblage for carrying out a comparison between a first signal and a second signal in consideration of a reference signal, the circuit assemblage encompassing: a first channel in which the first signal is processed; and a second channel in which the second signal is processed, a first differential amplifier, which obtains a first difference between the first signal and the reference signal, and a first unit for obtaining an absolute value, which obtains a first absolute value from the first difference, being provided in the first channel, and a second differential amplifier, which obtains a second difference between the second signal and the reference signal, and a second unit for obtaining an absolute value, which obtains a second absolute value from the second difference, being provided in the second channel; and a comparator that compares the first absolute value with the second absolute value.