Differential input buffer using local reference voltage and method of construction
US5990708A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Jan 30, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/2481
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential input buffer (14) and method of construction are provided. The differential input buffer (14) includes a differential amplifier (54, 56, 50, 52, 62, 64) connected to receive an input signal (IN). A local reference voltage generator (68, 70, 72) is connected to the differential amplifier (54, 56, 50, 52, 62, 64) and is connected to receive an external voltage reference (BLR) and to provide a local reference voltage (VREF) to the differential amplifier (54, 56, 50, 52, 62, 64). The local reference generator (68, 70, 72) is adjustable during construction to produce a desired level for the local reference voltage (VREF). The differential input buffer (14) also includes a hysteresis element (66, 74) that is connected to provide feedback to the differential amplifier (54, 56, 50, 52, 62, 64) and includes a buffer stage (76, 78, 80, 82, 84, 86) that is connected to receive an output of the differential amplifier (54, 56, 50, 52, 62, 64) and to drive an output signal (OUT). The buffer stage is also connected to the hysteresis element (66, 74) to provide a basis for the feedback to the differential amplifier (54, 56, 50, 52, 62, 64).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.