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Low-power feedforward amplifier

  • US 4,677,390 A
  • Filed: 02/24/1986
  • Issued: 06/30/1987
  • Est. Priority Date: 05/31/1985
  • Status: Expired due to Term
First Claim
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1. A low-power feedforward amplifier, comprising:

  • (a) a main amplifier(b) means for comparing a sample of an input signal supplied to said main amplifier with a sample of an output signal from said main amplifier, said comparing means producing an error signal proportional to the difference between said signal samples; and

    (c) means for amplifying said error signal and combining the amplified error signal with the main amplifier output signal in opposite phase, whereby distortion and noise products generated by said main amplifier are substantially cancelled, said amplifying and combining means including an error amplifier having a plurality of gain stages which share the same bias current.

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