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We need to measure a device that working under different current consumption
0.1uA to tens of mA (60-100mA)
Do you have any recommendation for components that can help to measred such wide current range
Patrick Simmons, TI Sensing Products Applications Support
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In reply to Patrick Simmons:
In addition to Patrick's comment on the range of current measurement being difficult with a single shunt/amplifier, the low-end of the current you want to measure (0.1uA) is less than any of our current sense amplifiers can measure due to the bias current on the inputs pins of the device. For measuring this current level, you need to look at instrumentation amplifiers that have extremely low bias currents.
In reply to DHarmon:
In reply to Mark Nohr:
No problem. we are working the issue actively. I've engaged an analog engineering specialist given the sensitivity of the design. We are planning on putting a front end on to amplify the signal (probably not a current mirror). If there are any recommended approaches or pitfalls we should watch out for, I'd greatly appreciate the insight.
For measuring such low currents, we do not have a current sense chip that can attain such resolution with high accuracy yet. However, you still may be able to come to an appropriate solution through using one of TI's instrumentation amplifiers. I would recommend reaching out to the Precision Amplifiers group on their forum here: https://e2e.ti.com/support/amplifiers/precision_amplifiers/
A nice front end indeed. We wound up pre-conditioning the lower range to match up electrical interface of the INA226 to take advantage of all the other features the INA226 offers. Switching horses at this point would mean a major architectural change.
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