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A micropower envelope detector for audio applications [hearing aid applications]

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3 Author(s)
Baker, M.W. ; Res. Lab. of Electron., MIT, Cambridge, MA, USA ; Zhak, S. ; Sarpeshkar, R.

A low-power envelope-detecting circuit for analog audio applications is implemented using a wide-linear-range transconductor (WLR OTA), a class-B mirror, and a simple current-mode peak detector. A DC-offset correction loop ensures insensitivity to DC input conditions. In a 1.5 μm BiCMOS technology, and over most of the 100 Hz-10 kHz audio frequency range, an experimental implementation yielded almost 60 dB of linear operation while consuming less than 5.3 μW of power from a 2.8 V supply.

Published in:

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on  (Volume:5 )

Date of Conference:

25-28 May 2003