Precision oscillator circuit
US5638031A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1996 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Jan 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0231
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A precision oscillator constructed from a reference current generator, a charge control stage, a capacitor, a comparator, and a voltage threshold generator is disclosed. The reference current generator generates a reference current which is used by the charge control stage to either charge or discharge the capacitor. The comparator compares the voltage on the capacitor to one of two voltages from the voltage threshold generator. The frequency of oscillation is controlled by an external resistor and an external capacitor. Alternatively, the frequency of oscillation can be controlled by adding or subtracting parallel transistors in a current mirror in the reference current generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.