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CONTINUOUSLY VARIABLE VOLTAGE-CONTROLLED PHASE SHIFTER

  • US 3,621,406 A
  • Filed: 12/09/1969
  • Issued: 11/16/1971
  • Est. Priority Date: 12/09/1969
  • Status: Expired due to Term
First Claim
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1. A phase shifter comprising:

  • phase-splitting means responsive to an input signal for providing four signals including first, second, third and fourth signals, each of the same frequency as the input signal, with said first, second, third and fourth signals having phase differences with respect to said input signal of 0*, 90*, 180* and 270*, respectively;

    signal summing means; and

    phase control diode means including four diodes coupled to said signal-summing means and to said phase-splitting means, with each diode in the path of a different one of said four signals, and;

    bias control means connected to said four diodes for controlling the states of conduction thereof, thereby to control the phase shift of the signal summed by said signal-summing means which is a function of said four signals and the states of conduction of said four diodes, with said bias control means being adapted to vary the states of conduction of said four diodes so as to continually vary the phase shift over the entire range from 0* to 360* with three of said four diodes being in a back biased state when the phase shift is n X 90* where n is an integer not greater than four and two of said diodes are in a back biased state when the phase shift is not an integer multiple of 90*.

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