Patent ID: 7777464

Claim:
A mixed type frequency compensating circuit, comprising: an integral component sub-circuit of a voltage-amplifier-type frequency compensating circuit configured to amplify an input voltage signal in a voltage mode and configured to perform a voltage regulation of a whole loop; and a proportional component sub-circuit of a transconductance-amplifier-type frequency compensating circuit configured to amplify the input voltage signal in a current mode and configured to increase a phase margin for stability; wherein the integral component sub-circuit comprises: a first resistor configured to have a first terminal to which the input voltage signal is applied; an operational amplifier configured to have a first input terminal coupled to a second terminal of the first resistor, a second input terminal to which the reference voltage is applied, and configured to amplify the input voltage signal in a voltage mode to generate a first amplified signal and provide the first amplified signal to a first output node; and a first capacitor coupled between the first output node and the first input terminal of the operational amplifier.