Method and circuitry for controlling a phase-locked loop by analog and digital signals
US6674824B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/193
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mixed-signal-controlled phase-locked loop is provided. This loop includes a mixed-signal-controlled oscillator circuit for generating an oscillating signal having an oscillating frequency and a phase in response to a digital control signal and an analog control signal, a phase-frequency detector circuit electrically connected to the mixed-signal-controlled oscillator circuit, detecting the phase and the oscillating frequency of the oscillating signal and comparing the phase and the oscillating frequency with those of a reference signal to generate an error signal after the phase and oscillating frequency are detected, and a mixed-control-signal-producing circuit electrically connected to the mixed-signal-controlled oscillator circuit and the phase-frequency detector circuit for receiving the error signal to output the analog control signal and the digital control signal to the mixed-signal-controlled oscillator circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.