Title :
A robust continuous time loop filter PWM class D amplifier with high linearity and good immunity to process variations
Author :
Hou, Hsin-Hong ; Lin, Chung-Wei ; Chen, Wen-Tzao
Author_Institution :
STC, Ind. Technol. Res. Inst., Hsinchu, Taiwan
Abstract :
This paper describes a robust PWM class D amplifier with high linearity and good immunity to process variations. By using the proposed adaptive triangular wave generator (ATG), 0.0042% THD+N and 99.2 dB dynamic range is achieved in this design. The standard deviation of THD+N ratio over 22 samples can be smaller by 4 times compared to the results without the adaptive triangular wave generator. This chip integrates power MOS stages and 2 channel design. The supply voltage is from 3 V to 5.5 V and the die area is 2.45 mm × 2.9 mm.
Keywords :
CMOS integrated circuits; continuous time filters; pulse width modulation; waveform generators; CMOS technology; adaptive triangular wave generator; immunity; linearity; power MOS stages; process variations; robust PWM class D amplifier; robust continuous time loop filter; standard deviation; voltage 3 V to 5.5 V; Costs; Delta-sigma modulation; Feedback; Feedforward systems; Filters; Linearity; Pulse amplifiers; Pulse width modulation; Robustness; Topology;
Conference_Titel :
Solid-State Circuits Conference, 2009. A-SSCC 2009. IEEE Asian
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4433-5
Electronic_ISBN :
978-1-4244-4434-2
DOI :
10.1109/ASSCC.2009.5357224
