Phase comparator circuit for high speed signals in delay locked loop circuit
US6194916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1997 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jun 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R25/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase comparator compares the phases of first and second signals with each other. The phase comparator has a first control circuit, a second control circuit, and a phase comparator unit. The first control circuit divides the frequency of the first signal by n in response to a third signal where n is an integer equal to or larger than 2. The second control circuit divides the frequency of the second signal by n in response to the third signal. The phase comparator unit compares the phases of signals provided by the first and second control circuits with each other. The phase comparator unit is capable of correctly comparing the phases of even high-speed signals with each other, and therefore, is applicable to a DLL circuit that operates on high-speed clock signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.