Attenuation cell for use in analog signal processing circuit, has error amplifier that receives error of two differential currents in input and generates two currents in order to minimize error

摘要

The cell has an attenuation factor control device including a converting circuit (30) receiving a voltage (Vct) and generating a differential current (Ix). A multiplier circuit (40) and an amplifier (60) generate respective differential currents (Iy, Iz). An error amplifier (50) receives an error of the currents (Iy-Iz) at an input and generates currents (IA, IB) in order to minimize the error.