Operational amplifier circuit and display apparatus with operational amplifier circuit for avoiding voltage overshoot
US11004421B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 2019 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Jan 7, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45358
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier circuit in a display apparatus which is fast-acting to prevent voltage overshoot comprises a pre-operational amplifier module, an output operational amplifier module, and an output module. Driving current from the pre-operational amplifier module is the basis of the output operational amplifier module generating a dynamic bias voltage to the output module. The output operational amplifier module detects the dynamic bias voltage and adjusts the bias voltage to be level with a specified voltage based on at least one control voltage. When the dynamic bias voltage is less than the specified voltage, the output operational amplifier module pulls up the bias voltage and when the bias voltage is larger than the specified voltage, the output operational amplifier module pulls down the bias voltage. The pull up and pull down speeds are proportional to the at least one control voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.