发明名称 |
High side current sense amplifier |
摘要 |
A single stage current sense amplifier is described that generates a differential output that is proportional to a current through a sense resistor. The voltage across the sense resistor is Vsense. The current sense amplifier includes a differential transconductance amplifier having high impedance input terminals. An on-chip RC filter filters transients in the Vsense signal. A feedback circuit for each leg of the amplifier causes a pair of input transistors to conduct a fixed constant current irrespective of Vsense, which stabilizes the transconductance. A gain control resistor (Re) is coupled across terminals of the pair of input transistors and has Vsense across it. The current through the gain control resistor is therefore Vsensex1/Re. A level shifting circuit coupled to each of the input transistors lowers a common mode voltage at an output of the amplifier. Chopper circuits at the input and output cancel any offset voltages. |
申请公布号 |
US8648623(B2) |
申请公布日期 |
2014.02.11 |
申请号 |
US201213448161 |
申请日期 |
2012.04.16 |
申请人 |
LIU HENGSHENG;PORTER EDSON WAYNE;MANLOVE GREGORY JON |
发明人 |
LIU HENGSHENG;PORTER EDSON WAYNE;MANLOVE GREGORY JON |
分类号 |
G01R19/00 |
主分类号 |
G01R19/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|