The difference between an op-amp on a silicon die and a discrete amplifier is thermal stability. 20K ohm is probably very high for the adjustable bias resistor.

Surprisingly, sensitivities are independent of Q. However, the higher the Q, the higher the op amp open loop gain must be to provide enough margin to accurately implement the required op amp closed ...

Maybe you are familiar with the op-amp as an extremely versatile component, and you know how to quickly construct a huge variety of circuits with one. Maybe you even have a favorite op-amp or two f… ...

Figure 1: It is well known that op amp input noise is modeled by inserting uncorrelated voltage sources and current sources at the input terminals of an ideal noiseless amplifier [2]. If your circuit ...

Concurrently, op-amp suppliers have continued to polish this CFB topology to serve many emerging requirements where very high slew rates, coupled with wide bandwidth, are desired as the gain is ...

The op amp has been massively documented over the years. As mentioned, it’s covered in college texts and many other trade books for engineers. No doubt you have several, as do I.