Period-modulated voltage controlled oscillator
US4178567A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1978 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | May 4, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/125
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An oscillator for producing an output whose frequency varies in correspondence with changes in the level of an input voltage, and which includes a base or clock oscillator operating at a fixed frequency, a counter operable to count a predetermined number of oscillations of said base oscillator to thereby measure a base time period, a ramp generator controlled by the input voltage signal and acting to produce a voltage ramp continuing for a period whose duration varies in accordance with variations in the level of the voltage signal, and means for producing an oscillating output signal having a period which includes a combination of the base period as determined by the counter and the variable period measured by the ramp generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.