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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.
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on (Volume:5 )
Date of Conference: 25-28 May 2003