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US 4,290,022 AGranted
Digitally programmable phase shifter
AssigneeGeneral Electric Company
InventorCharles M. Puckette
Life of this patent
Estimating the term…
Abstract
A phase shifter is disclosed which provides a reference-phase square-wave as a first output and a second square-wave of the same frequency as the reference-phase square-wave and having the phase thereof shifted, with respect to the reference-phase square-wave, synchronously by a phase increment which is programmable in steps equal to 360/2.sup.N degrees, where N is an integer equal to number of stages in a shift register receiving binary phase control information.
Claims10
Apparatus for providing an output signal having a phase shifted with respect to the phase of an input signal, comprising:
- first means receiving said input signal, having the desired output frequency, for simultaneously providing the input signal at a reference phase and a plurality K of signals each having the same waveshape as the input signal and at the input frequency and with each signal having a different one of K phases of 2.pi.N/K radians, with respect to the input signal phase, where N is an integer between one and K;
- and
- second means for synchronously selecting one of the K signals from said first means to provide the phase shifted output signal with a selected phase and with all phase shift changes occurring at transitions of the input signal.
Dependencies are inferred from the claim text.