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Linear power amplifier

  • US 6,043,712 A
  • Filed: 07/17/1998
  • Issued: 03/28/2000
  • Est. Priority Date: 07/17/1998
  • Status: Expired due to Term
First Claim
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1. A power amplifier stage for operating in a Cartesian feedback loop, the power amplifier stage comprising:

  • a linear radio frequency (RF) power amplifier, having an input signal from a Cartesian feedback forward path AC coupled at a first port, for amplifying the input signal and producing an output signal corresponding thereto AC coupled to a second port, the first port receiving a DC amplifier bias potential for controlling the power gain of the RF amplifier stage and the second port for receiving a power supply;

    a bias control for switchably providing the DC amplifier bias potential at the first port; and

    a supply control for switchably providing the power supply in response to the bias control at the second port, wherein the supply control includes a fuse sensor for disabling the second port in response to sensing a blown fuse coupled to the power supply.

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