High speed phase/frequency detector
US4598217A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1984 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Mar 19, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0898
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase/frequency detector to detect the phase/frequency difference between two signals comprises a first bistable circuit to produce a first output pulse in response to one of the two signals; a second bistable circuit to produce a second output pulse in response to the other of the two signals; a gate circuit coupled to the first and second bistable circuits responsive to the first and second output pulses to produce a reset pulse to reset the first and second bistable circuits after a predetermined time delay. A first circuit arrangement is coupled to the first bistable circuit and the gate circuit to reduce the width of the first output pulse and a second circuit arrangement is coupled to the second bistable circuit and the gate circuit to reduce the width of and invert the second output pulse. The second circuit arrangement includes a third circuit arrangement to equalize turn on and turn off times of the reduced width first output pulse and the reduced width second output pulse. A high speed switching arrangement is coupled to the first and the second circuit arrangements and a constant current arrangement for high speed switching of current into one of two electrical loads. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.