Amplitude controlled sawtooth generator
US7671642B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2006 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Jan 29, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sawtooth voltage generator has a first capacitor that is charged with a variable feedback control current to provide a sawtooth output signal with a controlled amplitude. A feedback loop includes a comparator that compares a version of the sawtooth output signal with a fixed voltage reference to provide a comparator output signal to a phase frequency comparator, the output of which controls a source of the variable feedback control current. A method includes controlling the amplitude of a sawtooth output signal by charging a capacitor in a sawtooth voltage generator with a variable feedback control current; comparing a version of the sawtooth output signal with a fixed reference voltage to provide a comparator output signal; processing the comparator output signal in a phase frequency comparator to provide up/down control signals; and controlling the variable feedback control current with the up/down control signals from the phase frequency comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.