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Multi-mode VCO for direct FM systems

  • US 7,974,374 B2
  • Filed: 05/16/2007
  • Issued: 07/05/2011
  • Est. Priority Date: 05/16/2006
  • Status: Active Grant
First Claim
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1. A multi-mode voltage-controlled oscillator comprising:

  • a voltage control input port to supply a common mode voltage;

    a first auxiliary input port;

    a second auxiliary input port, wherein the first auxiliary input port and the second auxiliary input port are accessed for direct modulation; and

    a LC tank circuit, wherein the LC tank circuit is configured to operate in accordance with a first frequency gain in response to a first signal received at the first auxiliary input port and in accordance with a second frequency gain in response to a second signal received at the second auxiliary input port, wherein the multi-mode voltage-controlled oscillator is configured so that either the first signal is received at the first auxiliary input port or the second signal is received at the second auxiliary input port, wherein the first frequency gain and the second frequency gain are different to cause different frequency modulation ranges.

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