Oscillator with capacitor charged and discharged by current proportional to a reference current
US4494088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0231
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A silicon integrated oscillator circuit is connected with a capacitor and produces a highly precise and stable triangular output voltage. Both the charge current and the discharge current are proportional to one reference current. A switching circuit terminates the charge and discharge intervals when the capacitor voltage reaches a level that is equal to intermediate points on first and second resistive-voltage-divider circuits, respectively. This is accomplished by a differential-transistor-pair comparator having the base of one transistor connected to a high voltage one of the reference points and a third transistor, which is connected collector to emitter across the one transistor, having a base connected to a low voltage one of the reference points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.