A CMOS Low Distortion Fully Differential Power Amplifier With Double Nested Miller Compensation

A four stages fully-differential amplifier that uses a double nested Miller compensated structure to lower harmonic distortion is presented. With a single 5V supply power dissipation is 10mW and THD is ¿83dB for a 6Vpp differential output signal at 10kHz and a load of 50¿. With 8¿ load and 10kHz, 4Vpp output signal, THD is ¿68dB. The chip area is 1000mils2 in a 1.5¿ n-well CMOS technology.