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Minimization of the power consumption in an oscillator

  • US 5,926,071 A
  • Filed: 01/07/1998
  • Issued: 07/20/1999
  • Est. Priority Date: 01/16/1997
  • Status: Expired due to Term
First Claim
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1. A method for controlling a current (Ib) of a voltage controlled oscillator of an oscillator circuit to maintain the current (Ib) at a predetermined level, comprising the steps of:

  • generating a DC voltage control signal which is proportional to an output level of the oscillator;

    applying the generated DC voltage control signal in a negative feedback loop to a circuit element (FET1) for a controlling of the current of the oscillator;

    providing an isolating amplifier for the oscillator, the isolating amplifier having a first transistor, the oscillator having a second transistor;

    arranging said first and said second transistors in a series circuit allowing said current (Ib) to flow through said first and said second transistors;

    connecting said circuit element (FET1) to one of said first and said second transistors;

    controlling the current (Ib) by the circuit element (FET1); and

    detecting said output level of the oscillator at said isolating amplifier for reducing a required magnitude of supply voltage to the series circuit.

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