Abstract: There is a need for providing a variable amplifier circuit suited for a semiconductor integrated circuit and a high-performance camera preprocessing LSI using the variable amplifier circuit. At first timing, a first input capacitor acquires a first signal. An amplifier circuit amplifies a second signal acquired to the second input capacitor according to a gain corresponding to a capacity ratio between the second input capacitor and a feedback capacitor composed of a variable capacitor device. At second timing, the second input capacitor acquires a second signal. The amplifier circuit amplifies the first signal according to a gain corresponding to a capacity ratio between the first input capacitor and the feedback capacitor. A variable gain amplifier circuit interleavingly amplifies the first signal and the second signal in synchronization with the first timing and the second timing.

Abstract: There is a need for providing a variable amplifier circuit suited for a semiconductor integrated circuit and a high-performance camera preprocessing LSI using the variable amplifier circuit. At first timing, a first input capacitor acquires a first signal. An amplifier circuit amplifies a second signal acquired to the second input capacitor according to a gain corresponding to a capacity ratio between the second input capacitor and a feedback capacitor composed of a variable capacitor device. At second timing, the second input capacitor acquires a second signal. The amplifier circuit amplifies the first signal according to a gain corresponding to a capacity ratio between the first input capacitor and the feedback capacitor. A variable gain amplifier circuit interleavingly amplifies the first signal and the second signal in synchronization with the first timing and the second timing.