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Hearing aid amplifier circuitry

  • US 5,745,587 A
  • Filed: 06/07/1995
  • Issued: 04/28/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Fees
First Claim
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1. A power amplifier comprising:

  • a. an interface stage having a first pair of current gain devices, each having a base connected to receive incoming voltage signals, and respective first and second outputs for current signals to which said voltage signals are converted by said interface stage;

    b. a first current gain stage having a first input connected to receive said current signals from said first output, a third output connected to a load, and a first variable gain means connected between said first input and said third output for increasing current gain in response to increases in said current signals; and

    c. a second current gain stage having a second input connected to receive said current signals from said second output, a fourth output connected to said load, and second variable gain means connected between said second input and said fourth output for increasing current gain in response to increases in said current signals.

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