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Trimmable variable compression amplifier for hearing aid

  • US 5,838,807 A
  • Filed: 10/19/1995
  • Issued: 11/17/1998
  • Est. Priority Date: 10/19/1995
  • Status: Expired due to Fees
First Claim
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1. A transconductance compression amplifier in a hearing aid comprising:

  • an input stage comprising an amplifier with an input port for receiving an input signal, an output port for outputting a compressed output signal, and a gain defined by a bias current;

    a first current source supplying a first current to a circuit common;

    a second current source supplying said bias current to said amplifier, wherein said second current source supplies current in variable relation to the amount of current supplied by said first current source;

    and wherein said variable relation is dependent on the output signal level from said transconductance compression amplifier.

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