I've been studying and working through the following article from Analog Dialogue 52-03, March 2018. https://www.analog.com/en/analog-dialogue/raqs/raq-issue-151.html, and in particular, page 2, Figure 4 and the expressions for VS/VE and VS/VG. I have been challenged and ultimately humbled by the analysis - I haven't been able to derive the expressions for VS/VE and VS/VG, and the words above Figure 3 "Turns Out, the Circuit is Not So Simple" ring true for me!
May I trouble you with a humble request for the working behind and insights into "Neubean runs to the white board and writes the following equations"? The attached article "Transimpedance Amplifier Analysis" by Erik Margan (from https://www-f9.ijs.si/~margan/Articles/trans_z_amplifier.pdf) contains a circuit which in some respects is quite similar (e.g., the current source is in the same location as the P-channel MOSFET gm(VS-VG), but instead of terminating in circuit ground, gm(VS-VG) connects to circuit ground via RO//ROUT). And then there are the complexities of RSENSE, ISENSE and VSOURCE, whereas in Margan's transimpedance amplifier circuit, Ci, Ii and the non-inverting op-amp input terminate to circuit ground.
