Title :
Acoustic readout circuit system without highpass filter for hearing aid
Author :
Lee, H.Y. ; Luo, C.H.
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Taiwan
Abstract :
A readout circuit system is designed for a hearing aid without a highpass filter. The system achieved an SNR of 42.3 dB and a third-order harmonic distortion ratio of 58 dB when the input voltage was 60 muV to attain output of 0.48 V. For 57.9 and 74.8 dB gains, the bandwidths were 60 Hz-106 kHz and 100 Hz-20 kHz, respectively. The 1.65 mm2 system chip consumes 222 muW in 0.35 mum CMOS process
Keywords :
amplifiers; hearing aids; low-pass filters; readout electronics; 0.35 micron; 0.48 V; 100E3 to 20 Hz; 222 muW; 57.9 dB; 60 muV; 60E3 to 106 Hz; 74.8 dB; CMOS process; acoustic readout circuit system; hearing aid;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20070416
