Title :
High PSRR Class AB Power Amplifier
Author :
Loikkanen, Mikko ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. & Inf. Eng., Oulu Univ.
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;
Conference_Titel :
Norchip Conference, 2006. 24th
Conference_Location :
Linkoping
Print_ISBN :
1-4244-0772-9
DOI :
10.1109/NORCHP.2006.329247
