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Power amplifier with bootstrap voltage clamp

  • US 5,945,877 A
  • Filed: 02/04/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 02/08/1996
  • Status: Expired due to Term
First Claim
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1. An amplifier output stage having an output transistor connected to a high supply voltage and having a bootstrap terminal coupled to a control terminal of the output transistor through control means, the output stage comprising:

  • a capacitor arranged between the bootstrap terminal and an output of the output stage for elevating a voltage at the bootstrap terminal above the high supply voltage; and

    means for limiting the voltage at the bootstrap terminal to no greater than a predetermined maximum threshold;

    wherein the means for limiting directly acts on the control terminal of the output transistor to reduce a conductivity of the output transistor when the voltage at the bootstrap terminal exceeds the predetermined threshold.

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