Digitally-Programmable and Personalizable CMOS Hearing Aid Circuit

A CMOS mixed-mode fully-differential signal processor, that constitutes the core of a hearing aid system, is introduced in this paper. The circuit is fully and remotely controllable by means of dual-tone multifrequency (DTMF) encoded tones, transmitted by an external unit. A general description of t...

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Bibliographic Details
Main Authors: Duque-Carrillo, J.F., Malcovati, P., Maloberti, F., Perez-Aloe, R., Reyes, A.H., Sanchez-Sinencio, E., Torelli, G., Valverde, J.M.
Format: Conference Proceeding
Language:English
Subjects:
Auditory system
Batteries
CMOS digital integrated circuits
CMOS process
Deafness
Filters
Gain control
Preamplifiers
Signal processing
Tuning
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Summary:A CMOS mixed-mode fully-differential signal processor, that constitutes the core of a hearing aid system, is introduced in this paper. The circuit is fully and remotely controllable by means of dual-tone multifrequency (DTMF) encoded tones, transmitted by an external unit. A general description of the whole system is provided, and the implementations of some outstanding parts are covered in more detail. The circuit has been fabricated in 1.2 μm CMOS n-well process. It operates from a single 1.3-V battery, consumes tipically less than 1 mA and occupies 28 mm 2 of silicon. Experimental results of the described parts are also reported.