CIRCUIT060039
Low (microamp), high-side, current-sensing circuit with current-sensing amplifier
CIRCUIT060039
Overview
This circuit demonstrates how to use a current sense amplifier to accurately and robustly measure small micro-amp currents and maximize dynamic range. The following error analysis can be applied to many current sense amplifiers. This design relies on using a precision, low input-bias current sense amplifier and analyzing the dynamic error due to input bias currents on large shunt resistors.
Features
- Input:
- Iload = 1 μA - 104 μA
- Vcm = –0.1 V ≤ Vcm ≤ 40 V
- Output:
- Vout = 31.0 mV at 1 μA and 3.224 V at 104 μA
- Supply:
- Iqmax = 65 μA
- Vvs = 3.3 V
- Vee = 0 V
- Temperature
- Low = 0°C
- High = 85°C
Get started
- Read the circuit design
- Download the model
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Circuit design | Low (microamp), high-side, current-sensing circuit with current-sensing amp (Rev. A) | PDF | HTML | Sep 25, 2024 | |
| E-book | An Engineer's Guide to Current Sensing (Rev. B) | Apr 12, 2022 | ||
| Application brief | Using An Op Amp for High-Side Current Sensing (Rev. A) | PDF | HTML | Dec 7, 2021 | |
| Selection guide | Current Sense Amplifiers (Rev. E) | Sep 20, 2021 |