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Power amplifier in bicmos technology having an output stage in MOS technology

  • US 5,910,748 A
  • Filed: 07/16/1997
  • Issued: 06/08/1999
  • Est. Priority Date: 07/16/1996
  • Status: Expired due to Term
First Claim
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1. A power amplifier having an output stage in MOS technology, including:

  • an upper half-output stage comprised of a first and a second P-channel MOS power transistors mounted as a current mirror;

    a lower half-output stage comprised of a first and a second N-channel MOS power transistors mounted as a current mirror;

    an output terminal corresponding to the common drains of the first P-channel MOS power transistor of the upper half-output stage and of the first N-channel MOS power transistor of the lower half-output stage; and

    a control stage in bipolar technology for setting, according to a control voltage, two control currents of the upper half-output stage and the lower half-output stage, the control stage including;

    a first PNP-type bipolar transistor setting a first current for controlling the upper half-stage;

    a second NPN-type bipolar transistor setting a second current for controlling the lower half-stage; and

    an input terminal for receiving the control voltage and connected to the respective bases of the first and second bipolar transistors.

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