Title :
A novel self-tuning pulse width modulator based on master-slave architecture for a Class D amplifier
Author :
Tan, M.T. ; Chang, J.S. ; Tong, Y.C.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
Abstract :
In this paper, we propose a novel self-tuning pulse width modulator based on master-slave architecture for a Class D amplifier for hearing aid applications. The design methodology employs very simple tuning circuits and can be easily fabricated in a low cost digital CMOS process. The PWM circuit consumes 24 μA at 2.5 V (10 μA at 1.3 V). This design is thus suitable for micropower low voltage applications including hearing instruments. Measurements on the prototype IC shows that the error at zero-input 50% duty cycle is 1.5% and the total harmonic distortion is 3.3% at near full modulation index
Keywords :
CMOS analogue integrated circuits; audio-frequency amplifiers; circuit tuning; harmonic distortion; hearing aids; low-power electronics; power amplifiers; pulse width modulation; 1.3 V; 10 muA; 2.5 V; 24 muA; CMOS; Class D amplifier; full modulation index; hearing aid applications; master-slave architecture; micropower low voltage applications; self-tuning pulse width modulator; total harmonic distortion; tuning circuits; Auditory system; CMOS process; Circuit optimization; Costs; Design methodology; Low voltage; Master-slave; Pulse amplifiers; Pulse width modulation; Space vector pulse width modulation;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780644
