CLASS AB POWER AMPLIFIER EMPLOYING ULTRA-LOW VOLTAGE CMOS

摘要

PROBLEM TO BE SOLVED: To provide class AB power amplifier employing an ultra-low voltage CMOS for applications with small load impedance, which utilizes gate-source parasitic capacitance of a device for the compensation capacitance.;SOLUTION: The class AB power amplifier is provided with a PMOS output transistor(TR) having the gate driven by a PMOS drive TR in response to a noninverting input signal and an NMOS output TR having the gate driven by an NMOS drive TR in response to an inverting input signal, builds up a class AB output stage by the above TRs and selectively combines the gate- source parasitic capacitance of the PMOS output TR and the gate-source parasitic capacitance of the NMOS output TR in order to utilize a prescribed gate- source parasitic capacitance as the compensation capacitance.;COPYRIGHT: (C)2002,JPO