Class-d BICMOS hearing aid output amplifier

Electrical audio signal processing systems and devices – Sound effects – Reverberators

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381 682, 381 68, 330 10, H04R 2500

Patent

active

052475816

ABSTRACT:
An invention, which is fabricated using a Bipolar and Complementary Metal Oxide Semiconductor (BICMOS) technology which offers both bipolar and CMOS devices on the same silicon substrate is disclosed. The major part of the internal circuitry uses bipolar devices while the output circuit driving the transducer at the output uses CMOS inverters. A voltage regulator which is fed from the battery lines is used to power the majority of the internal circuitry leaving only the CMOS output driver and part of a level converter to be powered directly from the battery lines. This architecture guarantees that no signal is fed back to the previous stages of the hearing aid system through the battery lines, ensuring stable operation for an extended range of the battery internal impedance value. The bipolar front-end blocks of the circuit are designed using low-voltage bipolar design techniques to operate at the 1 volt level produced by the internal voltage regulator. The voltage regulator employs a bipolar base-emitter voltage reference, which ensures the tracking of its output voltage with the headroom requirements of the bipolar circuitry over the temperature and process variations.

REFERENCES:
patent: 4360707 (1982-11-01), Joseph et al.
patent: 4517415 (1985-05-01), Laurence
patent: 4689819 (1987-08-01), Killion
"The Miller Integrator", B. H. Briggs, Aug. 1948 (pp. 243-247).

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