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Circuit configuration for an integratable and controllable ring oscillator

  • US 5,038,118 A
  • Filed: 09/05/1990
  • Issued: 08/06/1991
  • Est. Priority Date: 09/05/1989
  • Status: Expired due to Fees
First Claim
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1. Circuit configuration of an integratable and controllable ring oscillator for generating a clock signal, comprising:

  • first and second stages being connected between supply terminals and having input and output terminals, said output terminal of said first stage being connected to said input terminal of said second stage, an inverter connected between said output terminal of said second stage and said input terminal of said first stage, and said input terminal of said second stage supplying a clock signal;

    each of said stages including first and second transistors having load paths connected between said supply terminals in a series circuit with a connecting point between said transistors, said second transistor having a gate terminal connected to said input terminal, said first transistor determining the frequency of the clock signal, being controllable in accordance with a control variable and acting as a current source, a capacitor having one terminal connected to said connecting point and another terminal connected to a fixed potential, and a decoupling stage connected between said output terminal and said connecting point.

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