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Control circuit for a complementary metal-oxide semiconductor voltage controlled oscillator

  • US 6,014,062 A
  • Filed: 04/21/1998
  • Issued: 01/11/2000
  • Est. Priority Date: 04/21/1998
  • Status: Expired due to Term
First Claim
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1. A complementary metal-oxide semiconductor (CMOS) voltage controlled oscillator (VCO) comprising:

  • a plurality of variable delay elements connected in a ring configuration;

    each variable delay element including at least two CMOS current source transistors operable in a differential mode to establish a signal delay through the variable delay element in response to a differential control signal with two components; and

    a control circuit having a first section for generating a control current, and a pair of current mirror sections, the current mirror sections connected, in parallel, to the first section for dividing the control current, each current mirror section including at least one CMOS transistor configured as a current mirror to provide a respective component of the differential control signal.

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