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Multi-mode power amplifier

  • US 5,541,554 A
  • Filed: 03/06/1995
  • Issued: 07/30/1996
  • Est. Priority Date: 03/06/1995
  • Status: Expired due to Term
First Claim
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1. An amplifier having a first operation mode and being responsive to a control signal to select a second operation mode, the amplifier comprising:

  • an amplifier input portion;

    an amplification gain stage, comprising;

    a first gain path coupled to the amplifier input portion;

    a second gain path coupled in parallel with the first gain path to the amplifier input portion, the second gain path comprising an amplification component, the amplification component having a selectively enabled radio frequency (RF) low impedance termination to ground;

    an impedance transformation network coupled to the amplification component; and

    RF switch formed from the application component and the impedance transformation network, the RF switch being responsive to the control signal to enable the RF low impedance termination to ground at the amplification component such that the impedance transformation network presents a high impedance, thereby disabling the second gain path to select the second operation mode.

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