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VLSI Design
Volume 2016 (2016), Article ID 6708253, 7 pages
Research Article

A 69-dB SNR 89-μW AGC for Multifrequency Signal Processing Based on Peak-Statistical Algorithm and Judgment Logic

1School of Electronic and Information Engineering, North China University of Technology, Beijing 100144, China
2School of Opto-Electronic and Communication Engineering, Xiamen University of Technology, Xiamen 361024, China

Received 21 October 2016; Revised 28 November 2016; Accepted 7 December 2016

Academic Editor: Chien-In Henry Chen

Copyright © 2016 Lan Dai and Chengying Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A novel peak-statistical algorithm and judgment logic (PSJ) for multifrequency signal application of Autogain Control Loop (AGC) in hearing aid SoC is proposed in this paper. Under a condition of multifrequency signal, it tracks the amplitude change and makes statistical data of them. Finally, the judgment is decided and the circuit gain is controlled precisely. The AGC circuit is implemented with 0.13 μm 1P8M CMOS mixed-signal technology. Meanwhile, the low-power circuit topology and noise-optimizing technique are adopted to improve the signal-to-noise ratio (SNR) of our circuit. Under 1 V voltage supply, the peak SNR achieves 69.2 dB and total harmonic distortion (THD) is 65.3 dB with 89 μW power consumption.