Hello analog zone community,
I've been enjoying and reading this post but I don't understand how the circuit in figure.1 works (basically all circuits in the post are the same as the circuit in figure.1). There is a JFET pair configured as differential follower and it is followed by a low noise opamp which has no feedback from its output to its input. How the gain of this such circuit controlled? Isn't a minute difference between the opamp's input satures the opamp in the circuit? How the feedback network is implemented here or is there a feedback network at all?