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Power amplifier and communication unit

  • US 6,313,699 B1
  • Filed: 06/13/2000
  • Issued: 11/06/2001
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
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1. A communication unit comprising:

  • a first amplifier having an input node and an output node;

    a second amplifier having an input node and an output node operable in a first mode at a first frequency;

    and output matching circuit having an input node and an output node operable in a second mode at a second frequency;

    a first switch having a single-pole node and two or more multi-throw nodes;

    a second switch having a single-pole node and two or more multi-throw nodes; and

    an antenna, wherein the output node of the first amplifier is connected to the single-pole node of the first switch, at least one of the multi-throw nodes of the first switch is connected to the input node of the second amplifier and at least another multi-throw node of the first switch is connected to the input node of the output matching circuit, the output node of the second amplifier is connected to one of the multi-throw nodes of the second switch and the output node of the output matching circuit is connected to another multi-throw node of the second switch, the single-pole node of the second switch is connected to the antenna whereby in synchronization with the first switch, operation in either the first mode or the second mode is provided, and the first frequency is different from the second frequency.

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