System and method providing bandwidth adjustment in integral path of phase locked loop circuitry
US8581644B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2012 |
| Grant date | Nov 12, 2013 |
| Priority date | — |
| Expiry date | Jul 9, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/091
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system incorporating and method of operating phase locked loop circuitry. In one embodiment, having programmable circuitry for adjustment of loop dynamics, a VCO has a first input terminal for selecting phase and frequency characteristics of an output signal and an output terminal on which the output signal is provided. A detector generates first VCO input signals indicative of phase and frequency differences between the VCO output signal and a reference signal. Circuitry digitizes the first VCO input signals and generates an integral path input signal therefrom. Slow integral path circuitry comprising, a first transistor device and a programmable low pass filter: receives the integral path input signal, and provides a low pass filtered version of the integral path input signal to control conduction through the first transistor device and provide a first adjustment signal for adjustment of the frequency of the VCO output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.