TLV9161-Q1: high side current sensing for high frequency applications

Hello Renjini,

According the blog: https://e2e.ti.com/blogs_/b/analogwire/posts/four-ways-to-design-an-amplifier-without-a-rail-to-rail-op-amp

The input common-mode voltage (Vcm) is (V_REF + V_IN+ * G)/(G+1), where G is the differential gain of the circuit, V_REF is the termination voltage for noninverting divider and V_IN+ is the noninverting differential input. Lower gains reduce the required input common-mode range.

This will force signal gain below 1; the op amp gain is higher by 1, so less than 2 total. 4MHz * 2 = 8MHz. Add bandwidth margin based on how much distortion is acceptable; 50MHz device should do well. Above that reduces options and can raise costs.

OPA2607-Q1 is 50MHz and has low Vos

OPA355-Q1 is faster but less accurate DC value.