Differential input buffer circuit with rail-to-rail input range
US7262651B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Oct 26, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018528
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input buffer circuit achieving rail-to-rail operation maintains a uniform common mode output voltage even though an input signal having any voltage level is inputted. The input buffer circuit has a differential amplifier structure receiving two differential input signals. A first input part has a first inverter circuit into which a first differential input signal is inputted, and a second input part has a second inverter circuit into which the second differential input signal is inputted. The first inverter circuit has a first output node connected to a diode structure having an operating current twice the operating current of the first inverter circuit, and outputs a first output signal. Rail-to-rail operation is achieved, and a common mode output voltage is provided uniformly, with reduced current consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.