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Frequency multiplier with programmable order of multiplication

  • US 4,967,160 A
  • Filed: 06/22/1989
  • Issued: 10/30/1990
  • Est. Priority Date: 06/24/1988
  • Status: Expired due to Fees
First Claim
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1. A frequency multiplier circuit with variable multiplication order comprising a comb generator that receives, at input, a signal at the base frequency to be multiplied, and gives , at output, a composite pulse signal having a plurality of harmonic lines of the base frequency, said comb generator being followed by a pass-band filter that can be tuned selectively to one of these harmonic lines, and comprising logic means having two complemented outputs, one synchronous input, the actuation of which controls the changing of these outputs from one logic state to the other, and one asynchronous input, the actuation of which controls, independently of the state of the synchronous input, the changing of these outputs to the states complementary to those generated by the actuation of the synchronous input;

  • the base frequency signal being biased beforehand so that its excursion makes place around the transition voltage controlling the change from one logic state to the other, said signal being applied to the synchronous logic means, a first output of these means being connected to the asynchronous input and the second output delivering said composite pulse signal to the pass-band filter located downstream.

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