Low voltage current sense amplifier circuit
US6492845B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Dec 27, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current sense amplifier including a transconductance amplifier to measure a current passing through a sense resistor and generate a reference current indicative of the measured current. A current mirror circuit is connected to the transconductance amplifier and receives the reference current for amplification to generate an amplified output current. A cascode circuit is connected serially to the current mirror circuit to boost an output impedance for the amplifier at the output of the generated amplified output current. The current mirror circuit and cascode circuit of the current sense amplifier are each formed from a pair of transistors sharing a common control node, with the transistors realized using with bipolar or MOS technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.