Digital control loop to improve phase noise performance and RX/TX linearity
US7012472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2004 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Jul 9, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1293
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system or method for controlling a voltage controlled oscillator (VCO) or LO buffer includes an amplitude detector for detecting an amplitude value at a node corresponding to the at least one output line. A comparator compares the detected amplitude value with a predetermined amplitude value, and outputs a first digital value when the detected amplitude value is greater than the predetermined amplitude value, and a second digital value when the detected amplitude value is less than the predetermined amplitude value. An accumulator accumulates outputs of the comparator so as to provide an accumulated digital amplitude value. A digital-to-analog converter converts the accumulated digital amplitude value to an accumulated analog amplitude value. The analog accumulated amplitude value is provided as an updated bias control signal to the bias transistor of the VCO or LO buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.