System and method for adjusting a characteristic of a periodic signal with use of a filtered bias voltage
US8508270B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2012 |
| Grant date | Aug 13, 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
Circuits and methods for controlling a VCO output signal. A filtered version of an integral path input signal controls current flow through a proportional path. An exemplary embodiment generates an integral path input signal from a digital to analog converter. First integral path circuitry includes a first transistor device and a low pass filter which provides a filtered version of the integral path input signal to a first transistor device to control conduction through the device, providing a first VCO input signal for frequency adjustment of the output signal. Proportional path switching circuitry between a supply terminal and VCO input terminal includes a second transistor device which receives the first VCO input signals to control conduction between the supply terminal and the first VCO input terminal to provide a second signal for adjustment of the phase of the VCO output signal relative to the reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.