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Power amplifier input structure having a differential output

  • US 20050134386A1
  • Filed: 12/22/2003
  • Published: 06/23/2005
  • Est. Priority Date: 12/22/2003
  • Status: Active Grant
First Claim
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1. A circuit for transforming a singled-ended signal to a differential signal for use by an RF power amplifier suitable for transmitting signals in an RF communication system comprising:

  • a silicon semiconductor device;

    an RF power amplifier formed on the semiconductor device;

    a transformer formed on the semiconductor device, the transformer having a primary side with first and second terminals, and a secondary side with first and second terminals coupled to the RF power amplifier; and

    wherein an RF input signal is coupled to the first terminal of the primary side of the transformer, and wherein a reference node is coupled to the second terminal of the primary side of the transformer, producing a differential RF signal at the first and second terminals of the secondary side of the transformer.

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