Discussion
A resistor from an amplifier's output to its inverting input, with the signal at that same node, is which topology?
Answer: B
The network connects across the output, so it samples voltage, and it joins the signal at a single input node, so the return is in shunt - voltage shunt feedback. Both impedances are therefore lowered, which is the inverting operational amplifier configuration and the transimpedance amplifier. Reading the two words off the circuit's two connections is quicker and more reliable than recognising the arrangement by its shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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