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Programmable relaxation oscillator

  • US 6,377,129 B1
  • Filed: 04/30/1999
  • Issued: 04/23/2002
  • Est. Priority Date: 04/30/1999
  • Status: Expired due to Term
First Claim
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1. An oscillator comprising:

  • a slope-fixing circuit that generates a control signal and fixes the slope of the control signal, the slope fixing circuit comprising a floating timing capacitor block that has an effective capacitance C and a current supply block that supplies a control current I, wherein the slope of the control signal is determined by the ratio of the control current to the effective capacitance (I/C), and wherein the timing capacitor block comprises a fixed timing capacitor C1 and at least one switchable timing capacitor C2 connected in parallel with C1;

    a swing-fixing circuit that fixes the swing of the control signal; and

    a switching block that generates an oscillator output signal, wherein the oscillator output signal has a frequency derived from the swing and the slope of the control signal.

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