Hi Danilo,
TIPD175 provides a pretty in depth error analysis of the circuit in Appendix B of the document. Can the customer use this as a starting point? The typical error sources in a design are due to the offset voltage, input bias current, CMRR,…
Hello Ibrahim,
Unfortunately the desired bandwidth (10MHz) is beyond the bandwidth of our monolithic difference and instrumentation amplifiers. Perhaps you can build a discrete difference amplifier using a wide bandwidth precision op amp (e.g. OPA211…
Hello Mohammad,
Given such large voltages, a discrete difference amplifier is likely your best option. Such a circuit looks like your first figure but without the level shifter since VREF can be added using the differential amplifier. With respect…
Hello Degu,
This is similar to a TI Precision Design that we have. You may find some if it helpful. Here is the link: http://www.ti.com/tool/tipd175
Note that the layout is important...make the input traces as short and balanced as possible. Be sure…
Hello Francois,
The op amp you are looking for is the OPA2333 —which is the OPA333 op amp in a dual package. This rail to rail op amp with low offset voltage, low supply voltage, and the BW you require will work perfectly.
We have a TI Precision Design…
Hello Scott,
It is likely that the customer can simply use an op amp (I assume that's what you mean by "OP"), but first I would like some additional information:
1) What power supplies are available for the sensing circuitry?
2) Does the customer…
Hello Paolo,
Detecting such a wide range of current is definitely challenging, especially given 1MHz BW. The options we typically see are either changing the gain of the device (e.g. using a PGA as in TIPD135) or switching in different sense resistors…
