Fast, low offset ground sensing comparator
US7514966B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 2006 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Sep 3, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/2481
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fast, accurate, low offset comparator may be configured with multiple gain stages. A low gain, low input impedance, and fully differential common-gate amplifier may be configured as a first stage in the multi-stage comparator, providing a wide bandwidth for small power consumption. The inputs of the comparator may comprise a pair of differential inputs at respective source terminals of gate-coupled metal oxide semiconductor (MOS) devices configured in the input stage of the common-gate amplifier. A pair of differential outputs of the first stage may be coupled to a pair of differential inputs of a second stage, which may be a differential input current-mirror amplifier that may perform differential to single-ended conversion. The single-ended output of the second stage may serve as the input into a latch, which may be a bistable set-reset (SR) latch configured to increase the gain and response time while protecting against multiple switching, with the single-ended output of the latch configured as the output of the comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.