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Device for generating a reference voltage for a switching circuit including a capacitive bootstrap circuit

  • US 5,138,200 A
  • Filed: 10/18/1989
  • Issued: 08/11/1992
  • Est. Priority Date: 10/28/1988
  • Status: Expired
First Claim
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1. In a circuit including a driving block having an input receiving an input switching signal and an output generating a switching output voltage signal which switches between a low level and a high level, and a capacitive bootstrap circuit having a first terminal connected to said output of said driving block and a second terminal, a device for generating a floating reference voltage is connected between said output of said driving block and said second terminal of said capacitive bootstrap circuit, said device generating said floating reference voltage so as to follow said switching output voltage signal and avoid damage to said bootstrap circuit, said floating reference voltage switching to a low state, higher than said low level of said switching output voltage signal for charging said capacitive bootstrap circuit, when said switching output voltage signal switches to said low level, said floating reference voltage switching to a high state, near to said high level, when said switching output voltage signal switches to said high level.

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