Operational amplifier with built-in capacitor multiplier

Abstract

An operational amplifier with a built-in capacitor multiplier is provided, where the operational amplifier includes an input transistor, a current mirror circuit and a capacitor. The input transistor generates an input current according to an input signal, and the current mirror circuit generates a current mirror output current on a current output terminal of the current mirror circuit according to a current mirror input current corresponding to the input current received by a current input terminal of the current mirror circuit, where the current output terminal is coupled to an amplifier output terminal of the operational amplifier. In addition, a first terminal of the capacitor is coupled to the amplifier output terminal, and a second terminal of the capacitor is coupled to the current input terminal, making an equivalent capacitance of the capacitor seen on the amplifier output terminal be multiplied by the current mirror circuit.

Dependencies are inferred from the claim text.