Phase comparators
Patent 4851784 Issued on July 25, 1989. Estimated Expiration Date: 
March 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3469198 3610954 Frequency synthesizer having digital phase detector with optimal steering and level-type lock indication Patent #: 4764737 InventorsAssigneeApplicationNo. 07/168311 filed on 03/18/1988US Classes:327/12, With logic or bistable circuit327/3Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.)ExaminersPrimary: Miller, Stanley D.Assistant: Roseen, Richard Attorney, Agent or FirmInternational ClassH03D 13/00 (20060101)Foreign Application Priority Data1987-03-18 ZZAbstractA phase comparator accepts two streams of digital pulses, one being a reference signal and the other a test signal, and generates an output signal indicative of the phase difference. The phase comparator can be implemented as a four-state device or higher, and thus exhibits a wide phase capture range, i.e. multiples of 360°, and can provide a stable, predictable and linear output signal when the two input signals are in lock. It is therefore very suitable for use in a phase locked loop in which temporary wide variations in phase can occur. | |
