For the noninverting op-amp configuration, Ti = 1 as is To , but there are circuits (such as this transresistance amplifier) for which it is important to recognize that circuit elements involved in ...

In Seemingly Simple Circuits: Transresistance Amplifier, Part 1– Approximating Op-Amps, the op-amp was approximated from a single-pole, finite gain amplifier to an infinite-gain, single-pole op-amp, ...