Back to results
US 5,311,152 AGranted
Phase locked loop with D.C. modulation
AssigneeEmhiser Research Limited
InventorLloyd L. Lautzenhiser
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEmhiser Research Limited
InventorLloyd L. Lautzenhiser
Estimating the term…
A D.C. modulated phase locked oscillator (60, 80, 100, 140, 160, 190, 220, 264, or 290) includes a phase locking oscillator (70, 90, 128, 180, 192, 222, 266, or 292) and a D.C. modulator (72, 92, 130, 156, 182, 194, 224, 268, or 294). Both a forward path (14) and a feedback path (16) are D.C. modulated. D.C. modulation of the feedback path (16) optionally includes changing the frequency in the feedback path (16) as a function of the frequency of a modulation oscillator (64), changing the frequency in the feedback path (16) by a plurality of pulses for each cycle of the modulation oscillator (64), removing pulses from the feedback path (16), adding pulses to the feedback path (16), dividing the frequency in the feedback path (16) by higher and lower dividing ratios, preventing one cycle in the feedback path (16) from developing a "high" in the feedback path (16), holding a "high" in the feedback path ( 16) between two adjacent pulses, mixing quadrature frequencies with the feedback frequency in the feedback path (16), changing one input to a variable modulus divider (48) by means of a parallel adder (272), and using logic elements (148) to remove pulses from the feedback path (16).
An electrical device (80, 100, 140, 160, 190, 220, 264, or 290) which comprises phase locking oscillator means (90, 128, 154, 180, 192, 222, 266, or 292), having a loop (12) with a forward path (14) that includes a comparator (26) and a variable frequency oscillator (22) that is operatively connected to said comparator, and with a feedback path (16) that feeds pulses of a feedback frequency from said variable frequency oscillator back to said comparator, for producing an output that is phase locked to an input frequency, the improvement which is characterized by:
An electrical device (100, 140, 160, 190, 220, 264, or 290) which comprises phase locking oscillator means (128, 154, 180, 192, 222, 266, or 292), having a loop (12) with a forward path (14) that includes a comparator (26) and a variable frequency oscillator (22) that is operatively connected to said comparator, and with a feedback path (16) that feeds pulses of a feedback frequency from said variable frequency oscillator back to said comparator, for producing an output that is phase locked to an input frequency, the improvement which is characterized by:
A method for producing a phase locked output that is D.C. modulated, which method comprises providing an input frequency, using said input frequency to generate an output frequency, using said output frequency to provide a feedback frequency, comparing said feedback frequency with said input frequency, and using said comparison to phase lock said output frequency to said input frequency, the improvement which is characterized by:
A method for producing a phase locked output that is D.C. modulated, which method comprises providing an input frequency, using said input frequency to generate an output frequency, using said output frequency to provide a feedback frequency, comparing said feedback frequency with said input frequency, and using said comparison to phase lock said output frequency to said input frequency, the improvement which is characterized by:
Dependencies are inferred from the claim text.