System and method for controlling common mode voltage via replica circuit and feedback control
US9647618B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2016 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | Mar 30, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45418
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to a system and method for controlling a common mode voltage of an output differential signal of a differential signal processing circuit using a replica circuit and feedback control. The differential signal processing circuit includes two load devices, two input transistors, and two current-source transistors coupled in series between voltage rails, respectively. The replica circuit includes replica load device, replica input transistor, and replica current-source transistor coupled in series between the voltage rails. The common mode voltage of the input differential signal is applied to the replica input transistor to generate a replica output common mode voltage. A feedback circuit generates a bias voltage for the replica current-source transistor and the current-source transistors of the differential circuit to set and control the replica output common mode voltage and the output common mode voltage of the differential signal processing circuit to a target common mode voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.