Operational amplifier and method of amplifying with the operational amplifier
US9344048B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2015 |
| Grant date | May 17, 2016 |
| Priority date | — |
| Expiry date | Mar 1, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45418
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier comprises an input pair, an aiding unit, an even number of amplification stages, a feeding unit, a first current source, a second current source. Both the input pair and the aiding unit are connected to the first current source. The input pair receives differential input voltage. Both the input pair and the aiding unit are further connected to a first stage of the even number of amplification stages. The even number of amplification stages are connected in series, and the last stage of the amplification stages outputs differential output voltages. The feeding unit is configured to receive a common mode voltage of the differential output voltages, and feeds a voltage on a first node of the feeding unit back to the aiding unit so as to provide bias voltage to the aiding unit. The aiding unit avoids dead lock of the input pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.