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Temperature compensated frequency generating circuit

  • US 5,870,004 A
  • Filed: 10/16/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 10/16/1997
  • Status: Expired due to Term
First Claim
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1. A temperature compensated constant frequency generator comprising:

  • a voltage controlled oscillator (VCO) generator having a frequency controlled by a control voltage which varies with temperature to compensate for the temperature dependency of said frequency to obtain a temperature compensated frequency,means to derive said control voltage by connecting a first forward-biased pn junction voltage which has a negative temperature coefficient in series with a voltage difference of two forward-biased pn junctions, said voltage difference having a positive temperature coefficient.

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