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A precision digital phase shift element for achieving precise phase shift of an input pulse train signal. The output is a pulse train at a frequency equal to the input signal frequency divided by N, and having N equally spaced phase states. The relative phase state of the output signal is reliably c

A precision digital phase shift element for achieving precise phase shift of an input pulse train signal. The output is a pulse train at a frequency equal to the input signal frequency divided by N, and having N equally spaced phase states. The relative phase state of the output signal is reliably controlled by selective deletion of pulses from the input signal pulse train. The selective deletion can be achieved by selectively gating the input pulse train, or by use of a dual modulus frequency divider circuit.

대표청구항 ▼

A precision digital frequency divider and phase shift system for frequency dividing a frequency Fclk of a periodic pulse train at an input terminal and precisely setting a second phase of an output signal in relation to a first phase of the output signal, comprising: digital frequency division circu

A precision digital frequency divider and phase shift system for frequency dividing a frequency Fclk of a periodic pulse train at an input terminal and precisely setting a second phase of an output signal in relation to a first phase of the output signal, comprising: digital frequency division circuit means responsive to said periodic pulse train to produce said output signal having a frequency equal to Fclk/N, where N is an integer; and programmable digital phase shift control circuit means responsive to a control signal representing a value c which determines a given number of input pulses, which determines a programmable phase shift magnitude and to an externally supplied phase shift strobe signal for initiating a phase shift operation, and wherein said phase shift strobe signal is a different signal from said output signal, said phase shift control circuit means connected to said frequency division circuit means for introducing a phase shift into said output signal, and setting said second phase of said output signal relative to said first phase of said output signal to said phase shift magnitude, wherein said output signal at a time preceding receipt of said phase shift strobe signal has said frequency Fclk/N at said first phase, and at a time subsequent to receipt of said phase shift strobe signal and following introduction of said phase shift has said frequency Fclk/N and said second phase which is offset from said first phase by said phase shift magnitude.