Differential line driver having adjustable common mode operation
US6507223B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2001 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Feb 22, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential line driver that includes a 1st operational amplifier, a 2nd operational amplifier, an adjustable reference module, a 1st feedback impedance, and a 2nd feedback impedance. First inputs (e.g. the inverting input or non-inverting input) of the 1st and 2nd operational amplifiers are coupled to receive an input signal. The 2nd inputs (e.g. the compliment of the 1st input) of the 1st and 2nd operational amplifiers are operably coupled to receive an adjustable reference voltage from the adjustable reference module. The adjustable reference module provides the adjustable reference voltage based on the common mode of the power source for the 1st and 2nd operational amplifiers (e.g. Vdd, Vss) and/or the common mode of the input signal. The 1st and 2nd feedback impedances, (e.g. resistors) are coupled from the output of the respective operational amplifiers to either the 1st or 2nd input of the respective operational amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.