Amplifier for voltage or current to frequency converter
US4786877A · kind A · utility
8Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jun 25, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An autozeroing operational amplifier for a voltage or current-to-frequency converter includes a master amplifier and a slave amplifier. The master amplifier uses the voltage across a master capacitor to control the polarization level of an MOS transistor. Changing this level changes the operation of a differential pair connected to a load thereby changing the amplifier's input offset voltage. The slave amplifier, similarly constructed, is connected to periodically refresh the voltage across the master capacitor to compensate for drift and temperature effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.