Apparatus and method for centrally controlling common mode voltages for a set of receivers
US10243531B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2017 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Sep 29, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential signal processing circuit includes a local common mode voltage control circuit for controlling a common mode voltage of an output differential signal generated by the differential signal processing circuit based on an external common mode control current generated by an external common mode voltage control circuit. The differential signal processing circuit, which may be configured as a variable gain amplifier (VGA) or a continuous time linear equalizer (CTLE), includes a pair of load devices, a pair of input transistors, and a pair of current source transistors coupled via separate paths between upper and lower voltage rails. The external control circuit includes a replica circuit including a replica load device, a replica input transistor, and a replica current source transistor. The external control circuit sets the replica common mode voltage to a target using a current, wherein the external common mode control current is based on that current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.