Title :
A low-power AGC with level-independent phase margin
Author :
Baker, Michael W. ; Lu, Timothy K T ; Sarpeshkar, Rahul
Author_Institution :
Dept. of Electr. Eng. Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA, USA
fDate :
June 30 2004-July 2 2004
Abstract :
We describe a 32-/spl mu/W 77dB-dynamic-range power-law-compression VLSI AGC circuit for use in audio applications particularly for hearing aids and cochlear implants. We demonstrate that in spite of the nonlinearities in the circuit, the feedback-loop phase margin is invariant with input level. This ensures that robust performance at one level guarantees robust performance at any level.
Keywords :
VLSI; automatic gain control; control nonlinearities; feedback; stability; 32 muW; VLSI AGC circuit; circuit nonlinearities; feedback-loop phase margin; level-independent phase margin; low-power AGC;
Conference_Titel :
American Control Conference, 2004. Proceedings of the 2004
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-8335-4
