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9th International Conference on VLSI Design: VLSI in Mobile Communication
A micropower analog hearing aid on low voltage CMOS digital process
Bangalore, INDIA
January 03-January 06
ISBN: 0-8186-7228-5
A.B. Bhattacharyya, Indian Inst. of Technol., New Delhi, India
R.S. Rana, Indian Inst. of Technol., New Delhi, India
S.K. Guha, Indian Inst. of Technol., New Delhi, India
R. Bahl, Indian Inst. of Technol., New Delhi, India
R. Anand, Indian Inst. of Technol., New Delhi, India
M.J. Zarabi, Indian Inst. of Technol., New Delhi, India
P.A. Govindacharyulu, Indian Inst. of Technol., New Delhi, India
U. Gupta, Indian Inst. of Technol., New Delhi, India
V. Mohan, Indian Inst. of Technol., New Delhi, India
J. Roy, Indian Inst. of Technol., New Delhi, India
A. Atri, Indian Inst. of Technol., New Delhi, India
A two-chip analog micropower hearing aid circuit is developed which is based on a low voltage three micron CMOS process. The novel features of the circuit are the use of adaptive biasing of MOS Translinear Loop (MTL) circuit and an innovative application of an adaptive technique in reducing the value of a degenerating linearising resistor in the input differential stage of the AGC block. The above two measures enable reduction of power consumption and external component count. Class-D amplifier provides high conversion efficiency at the output stage. The proposed configuration is now under integration for developing a one chip general purpose CMOS analog hearing aid with capability to operate with 1.0 volt supply voltage.
Index Terms:
hearing aids; CMOS analogue integrated circuits; differential amplifiers; automatic gain control; micropower analog hearing aid; low voltage CMOS digital process; adaptive biasing; MOS translinear loop circuit; degenerating linearising resistor; input differential stage; AGC block; power consumption; conversion efficiency; 3 micron; 1.0 V
Citation:
A.B. Bhattacharyya, R.S. Rana, S.K. Guha, R. Bahl, R. Anand, M.J. Zarabi, P.A. Govindacharyulu, U. Gupta, V. Mohan, J. Roy, A. Atri, "A micropower analog hearing aid on low voltage CMOS digital process," vlsid, pp.85, 9th International Conference on VLSI Design: VLSI in Mobile Communication, 1996
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