Wide capture range reference-less frequency detector
US10396805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2018 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Aug 31, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/099
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A reference-less frequency detector circuit includes a sampling circuit that is configured to generate a frequency control voltage and a switch circuit control signal based on a frequency difference between a clock signal frequency and an input data rate. The frequency control voltage has a frequency down indication and a frequency up indication. A voltage-to-current converter circuit is coupled to the sampling circuit and is configured to convert the frequency control voltage to a frequency control current based on the switch circuit control signal. The voltage-to-current converter circuit includes an output switch circuit controlled by the switch control signal and is configured to have substantially equal respective latencies for the frequency down indication and the frequency up indication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.