Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1995-10-18
1996-11-19
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327105, 327175, H03H 1116
Patent
active
055766528
ABSTRACT:
A digital phase shifter produces from an input clock signal quadrature pairs of the input clock signal. The quadrature pairs are mixed and summed in response to a desired phase angle control signal to produce a phase shifted clock signal. The quadrature pairs are produced from a counter having as input a signal at four times the input clock signal frequency, with one output being a signal at the input clock signal frequency. The clock output signal is delayed one-quarter of a cycle to form a quadrature clock output signal, and the in-phase and quadrature clock output signals are converted to complementary quadrature signals. The complementary quadrature signals are input to a double 4:1 multiplexer so as to produce for any selection signal a quadrature pair of signals at the output defining one of four quadrants. The selected quadrature pair is mixed in a 2:1 multiplexer by a selection signal that alternates between states as a function of the comparison between the most significant bits from the counter and a fine angle control signal. The output from the multiplexer is bandpass filtered at the input clock frequency to produce the phase shifted clock signal.
REFERENCES:
patent: 4297641 (1981-10-01), Sterzer
patent: 4799022 (1989-01-01), Skierszkan
patent: 5122757 (1992-06-01), Weber et al.
patent: 5317288 (1994-05-01), Yung et al.
Callahan Timothy P.
Gray Francis I.
Kim Jung Ho
Tektronix Inc.
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