Phase detector having a 360 linear range for periodic and aperiodic input pulse streams
AssigneeSperry Univac Corporation
InventorJules A. Eibner
Life of this patent
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Abstract
A phase detector comprising three bistable flops and a NAND gate interconnected to respond to a data input pulse stream and a controlled square wave clock pulse stream to provide, in response to each data pulse, a reference pulse having a width equal to one-half the clock pulse period and a variable pulse having a nominal width equal to that of the reference pulse and a proportionately greater or lesser width according to the direction and amount of displacement of the data pulse from the center of the clock period in which it occurs.
Claims12
A phase detector responsive to an input pulse stream and a square wave clock signal for producing in response to each input pulse a reference pulse having a duration substantially equal to one-half the clock pulse period and a variable pulse having a duration which is greater or less than the reference pulse duration in accordance with the direction and amount of time displacement of the input pulse from the center of the clock pulse cycle in which said input pulse occurs, said phase detector comprising:
- means responsive to an input pulse occurring in one cycle of the clock pulse signal for initiating a variable pulse,
- means responsive to the leading edge of the clock pulse occurring in the next cycle of the clock pulse signal for terminating the variable pulse and initiating a reference pulse, and
- means responsive to the transition of the clock pulse immediately following said leading edge for terminating the reference pulse.
A phase detector responsive to an input pulse stream and a square wave clock pulse signal for producing both a reference pulse and a variable pulse only in response to each input pulse, and phase detector comprising:
- means responsive to an input pulse occurring in one cycle of the clock pulse signal for initiating a variable pulse,
- means responsive to the leading edge of the clock pulse occurring at the next cycle of the clock pulse signal after initiation of the variable pulse for terminating the variable pulse whereby said variable pulse has a duration in accordance with the direction and magnitude of time displacement of the input pulse from the center of the clock pulse cycle in which said input pulse occurs, and
- means responsive to the clock pulse signal after occurrence of the input pulse for generating a reference pulse having a duration substantially equal to one-half the clock pulse period.
Dependencies are inferred from the claim text.