FIG. 3A shows a block diagram of a circuit serving as a multiplier circuit. The multiplier circuit 30 shown in FIG. 3A includes a circuit serving as a Gilbert circuit that operates with a differential signal, and analog potential holding circuits 45N and 45P that can hold an analog potential of the signal WW in accordance with the control of the signal CTR. Note that the Gilbert circuit is a circuit that can perform multiplication of two input signals.
A signal WWP and a signal WWN supplied to the block of the multiplier circuit 30 shown in FIG. 3A correspond to the signal WW and are supplied to transistors of a differential pair. A signal WINP and a signal WINN correspond to the signal WIN and are supplied to transistors of a differential pair. A signal CTRN and a signal CTRP correspond to signals of the signal CTR and have the same logic. A bias current IBIAS is a current supplied to a transistor for feeding a constant current. A back gate voltage VBG is a voltage supplied to back gates of transistors included in the analog potential holding circuits 45N and 45P. A signal IOUT is a current corresponding to the product of the signal WW and the signal WN.
