Patent ID: 7295143
Filing Date: 2007-11-13
Classification: H03G

Abstract:
1. A semiconductor integrated circuit device comprising: a first input capacitor; a second input capacitor; a feedback capacitor composed of a variable capacitor device; and an amplifier circuit, wherein, at first timing, the first input capacitor acquires a first signal, and the amplifier circuit amplifies the second signal acquired to the second input capacitor according to a gain corresponding to a capacity ratio between the second input capacitor and the feedback capacitor, wherein, at second timing, the second input capacitor acquires a second signal, and 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, and wherein a variable gain amplifier circuit interleavingly amplifies the first signal and the second signal in accordance with the first timing and the second timing.