Allegretti & Witcoff, Ltd.
Differential voltage threshold detector
A differential voltage threshold detector that may be used in a hearing aid circuit. The configuration includes an inherent differential/full wave operation, without the need for additional circuitry. The detector includes a differential transconductance stage, first and second "top" current mirrors (which respond to the transconductance stage), first and second "bottom" current mirrors (which respond to the top current mirrors) and a detector (which responds to the current levels in the mirrors). The detector effectively issues an output signal when the voltage applied to the threshold detector varies by more than a predetermined amount.
Beltone Electronics Corporation
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Richard James R.
Brander Anderson