Title :
A 1.1-V 270-μA mixed-signal hearing aid chip
Author :
Gata, D. George ; Sjursen, Walter ; Hochschild, James R. ; Fattaruso, John W. ; Fang, Lieyi ; Iannelli, Gerald R. ; Jiang, Zhongnong ; Branch, Charles M. ; Holmes, James A. ; Skorcz, Michael L. ; Petilli, Eugene M. ; Chen, Shuyou ; Wakeman, Gary ; Preves,
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
fDate :
12/1/2002 12:00:00 AM
Abstract :
This paper presents a single-chip mixed-signal IC for a hearing aid system. The IC consumes 270 μA of supply current at a 1.1-V battery voltage. The presented circuit and architectural design techniques reduce the total IC power to 297 μW, a level where up to 70 days of lifetime is achieved at 10 h/day for a small zinc-air battery. The measured input referred noise for the entire channel is 2.8 μVrms and the average THD in the nominal operating region is 0.02%. The jitter for the on-board ring oscillator is 147 ps rms. The chip area is 12 mm2 in a 0.6-μm 3.3-V mixed-signal CMOS process.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical electronics; digital-analogue conversion; harmonic distortion; hearing aids; integrated circuit noise; jitter; low-power electronics; mixed analogue-digital integrated circuits; 0.6 micron; 1.1 V; 270 muA; 297 muW; 3.3 V; 70 day; architectural design techniques; average THD; battery voltage; chip area; hearing aid system; input referred noise; mixed-signal CMOS process; nominal operating region; on-board ring oscillator jitter; sigma-delta ADC modulator; sigma-delta DAC; single-chip mixed-signal IC; small zinc-air battery; supply current consumption; total IC power; Auditory system; Battery charge measurement; CMOS process; Current supplies; Integrated circuit noise; Jitter; Noise measurement; Ring oscillators; Semiconductor device measurement; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.804328
