H - Electricity – 03 – F
Patent
H - Electricity
03
F
349/26
H03F 3/217 (2006.01) H03K 3/354 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1250362
ABSTRACT A sub-miniature power amplifier for hearing aids configured to be completely self- contained and to fit within the user's ear features a Class D amplifier stage providing a peak-to-peak output voltage greater than the power supply voltage. By configuring all signal elements as digital units, circuit balance is readily maintained. A substantial economy of battery drain is achieved while preserving a low value of distortion at low signal levels. Oscillator frequency is governed by a single resistance element. The amplifier and an optional efficiency-improving inductor can be accommodated entirely within the residual volume of the motor chamber of a state-of-the-art earphone housing. Pulse feedback networks are provided to achieve positive stable latching of each output pulse throughout its duration without producing significant pulse duration distortions.
509272
Industrial Research Products Inc.
Knowles Electronics Llc
Macrae & Co.
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