Bias circuit for a low voltage differential circuit
US6344762B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45596
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bias circuit that provides biasing for a differential circuit. The bias circuitincludes first and second transistors, first and second impedance devices, a reference current source and an amplifier. The first and second transistors each have a control input and a current path coupled between a first node and ground, where the control inputs of the first and second transistors receive the differential signal. The impedance devices are each coupled between a control input of one of the first and second transistors and a second node. The reference current source provides a reference current for the first node and the amplifier has an input coupled to the first node and an output coupled to the second node. The transistors of the bias circuit and the differential circuit may be matched, NPN bipolar junction transistors with emitters connected to ground. A filter capacitor may be coupled between the first node and ground and operates as a low pass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.