Input buffer circuit for transforming pseudo differential signals into full differential signals
US6456122B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2001 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Jul 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018528
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input buffer circuit for transforming pseudo differential input signals into full differential output signals wherein, the input buffer circuit includes a pull-up current source, two pull-down current sources, a differential input portion, and a positive feedback portion. The pull-up current source is formed of two PMOS transistors which are always in an “on” state, and provides an electric current. The two pull-down current sources are each formed of an NMOS transistor, which are always in an on state, and sink a pull-up electric current. The differential input portion is formed of two NMOS transistors, and receives an input signal and a reference signal, respectively. The positive feedback portion is formed of two NMOS transistors, and enlarges a voltage difference between two output terminals of the input circuit using positive feedback.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.