High accuracy comparator
US6288666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Nov 8, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/249
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An embodiment of the invention is directed to a metal oxide semiconductor field effect transistor (MOSFET) comparator, which includes a differential amplifier having first and second inputs and first and second outputs. A first offset storage device is connected to the first input at one end and receives a first input signal of the comparator at another end. A second offset storage device is connected to the second input at one end and receives the first input signal during an autozero time interval and a second input signal of the comparator thereafter. During the autozero time interval, offset voltages are stored. Thereafter, the offsets are cancelled when the input signals are applied to their respective storage device. In a particular embodiment of the invention, the amplifier features a dual purpose load that causes the amplifier to first preamplify and then regeneratively drives the outputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.