Dual-channel instrumentation amplifier
US7119612B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2004 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45521
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A dual-channel instrumentation amplifier includes two channels of PMOS transistor differential pairs which are configured in a Y-connection and cross-coupled to two diode-connected NMOS transistors. Each input channel has a non-linear voltage-current characteristic. But when the differential currents cancel at the NMOS transistor diodes, both input channels have the same differential input voltage, regardless of any non-linearity. As thus configured, a high accuracy instrumentation amplifier which operates in current mode is realized with excellent DC matching and high common mode rejection ratio. In one embodiment, the dual-channel instrumentation amplifier is used as input stage for the linear comparator to enable the linear comparator to operate at a high rate of speed with excellent channel matching.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.