Oscillator circuit employing frequency-locked loop feedback topology
US5994967A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jul 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated, crystalless oscillator includes a voltage controlled oscillator circuit for generating an output signal, and a frequency-locked feedback network to stabilize the frequency of the output signal. The frequency-locked feedback network includes a divide-down circuit and a frequency-controlled variable resistor, the divide-down circuit divides down the frequency of the output signal to produce a feedback frequency which is used to control the frequency-controlled variable resistor. The control voltage for the voltage controlled oscillator circuit is derived from the voltages across a fixed resistor and the frequency-controlled variable resistor. The voltages across these resistors drive an amplifier, with the output of the amplifier being the control voltage for the voltage controlled oscillator circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.