High PSRR Class AB Power Amplifier

Author

Loikkanen, Mikko ; Kostamovaara, Juha

Author_Institution

Dept. of Electr. & Inf. Eng., Oulu Univ.

fYear

2006

fDate

Nov. 2006

Firstpage

71

Lastpage

74

Abstract

A simple class AB power amplifier topology for wide supply range is presented, which combines feedback type class AB biasing with low voltage gain boosting. The amplifier uses Miller compensation with nulling resistor, but avoids typical poor midband power supply noise attenuation of Miller compensated amplifiers by creating a cancelling signal path from the power supply to the output, using limited gain boosting amplifier bandwidth and bias network. The amplifier achieves 10.6MHz unity gain frequency with phase margin of 51deg when driving 20pFpar10kOmega load and has approximately 63dB positive power supply noise attenuation at 100kHz frequency, while drawing 298muA from 3V supply

Keywords

circuit noise; network topology; power amplifiers; 10 kohm; 10.6 MHz; 100 kHz; 20 pF; 298 muA; 3 V; Miller compensation; class AB power amplifier topology; limited gain boosting amplifier bandwidth; nulling resistor; positive power supply noise attenuation; Attenuation; Boosting; Feedback; Frequency; High power amplifiers; Low voltage; Noise cancellation; Power amplifiers; Power supplies; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Norchip Conference, 2006. 24th

Conference_Location

Linkoping

Print_ISBN

1-4244-0772-9

Type

conf

DOI

10.1109/NORCHP.2006.329247

Filename

4126950