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Radio-frequency power amplifier of mobile communication equipment

  • US 6,259,901 B1
  • Filed: 12/01/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 07/03/1998
  • Status: Expired due to Fees
First Claim
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1. A radio-frequency power amplifier of mobile communication equipment, comprising:

  • an input stage including at least one differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; and

    a bias current circuit for supplying said at least one differential amplifier with a bias current varying in dependence on a gain control signal, to thereby variably set a gain of said at least one differential amplifier, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said input stage of said radio-frequency power amplifier amplifies the radio-frequency signal under a floating condition with respect to the radio-frequency grounding pattern.

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