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Programmable ring oscillator

  • US 6,388,533 B2
  • Filed: 12/19/2000
  • Issued: 05/14/2002
  • Est. Priority Date: 03/02/2000
  • Status: Active Grant
First Claim
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1. A ring oscillator clock circuit comprising:

  • a plurality of ring oscillator stages disposed in a linear chain from a first ring oscillator stage to a last ring oscillator state, each ring oscillator stage including a propagate input, a propagate output, a return input, a return output;

    a latch storing either a first state or a second state, said latch having a true output and a complement output, a first AND gate having a first input connected to said propagate input, a second input connected to said true output of said latch and an output connected to said propagate output, a second AND gate having a first input connected to said propagate input, a second input connected to said complement output of said latch and an output, and a third AND gate having a first input connected to said return input, a second input connected to said output of said second AND gate and an output connected to said return output;

    an output stage connecting said return output of said first ring oscillator stage to said propagate input of said first ring oscillator stage to circulate a ring pulse, said output stage generating an oscillator clock signal;

    wherein said propagate input of a ring oscillator stage is connected to said propagate output of a prior ring oscillator state;

    wherein said return input of a ring oscillator stage is connected to said return output of a next ring oscillator state;

    wherein said propagate output of said last ring oscillator stage is connected to said return input of said last ring oscillator stage.

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