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Transmitter and wireless communication apparatus using the transmitter

  • US 7,424,276 B2
  • Filed: 02/18/2003
  • Issued: 09/09/2008
  • Est. Priority Date: 05/31/2002
  • Status: Expired due to Fees
First Claim
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1. A transmitter comprising:

  • a phase control loop for controlling a phase of a carrier being output from a transmission oscillator; and

    an amplitude control loop for controlling an amplitude of a transmission being output signal output from a power amplifier,wherein a filter provided on said amplitude control loop for restricting a frequency band of said amplitude control loop is configured by a first 2nd-order passive filter including a capacitor and a resistor and a second passive filter including only a capacitor, and active current-output circuits are provided at respective front stages of said first 2nd-order passive filter and said second passive filter to isolate the transfer functions of said first 2nd-order passive filter and said second passive filter.

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