Title :
A micropower envelope detector for audio applications [hearing aid applications]
Author :
Baker, Michael W. ; Zhak, Serhii ; Sarpeshkar, Rahul
Author_Institution :
Res. Lab. of Electron., MIT, Cambridge, MA, USA
Abstract :
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.
Keywords :
BiCMOS analogue integrated circuits; audio signal processing; circuit feedback; current mirrors; current-mode circuits; hearing aids; integrated circuit design; integrated circuit measurement; low-power electronics; operational amplifiers; peak detectors; 1.5 micron; 100 Hz to 10 kHz; 2.8 V; 5.3 muW; BiCMOS; DC input condition insensitivity; DC-offset correction loop; WLR OTA; analog audio applications; audio frequency range; class-B current mirror; current-mode peak detector; low-power envelope-detecting circuit; micropower envelope detector; prosthetic hearing aid devices; wide-linear-range transconductor; Auditory system; Bandwidth; Circuits; Envelope detectors; Frequency; Hearing aids; Mirrors; Rectifiers; Signal detection; Transconductors;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1206157
