Chopper stabilized attenuation for sense amplifiers
US11218123B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2020 |
| Grant date | Jan 4, 2022 |
| Priority date | — |
| Expiry date | Mar 12, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0088
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current sense loop includes an attenuator circuit, which has an embedded input chopper circuit, and an amplifier circuit, which has an output chopper circuit. The embedded input chopper has a first chopper input that is coupled to a first attenuator input, a first chopper output that is coupled to a first attenuator output, a second chopper input that is coupled to a second attenuator input, and a second chopper output that is coupled to a second attenuator output. An amplifier has a first input coupled to the first attenuator output and a second input coupled to the second attenuator output. An NFET has a gate coupled to the amplifier output, a source coupled to a ground plane, and a drain coupled to the second attenuator input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.