I was looking at using the OPA860 for a voltage controlled load. Reading in the OPA860 datasheet it says:
The OPA860 combines a high-performance buffer with a transconductance section. This transconductance section is discussed in the OTA The buffer section of the OPA860 is an 1600MHz, (Operational Transconductance Amplifier) section of 4000V/μs closed-loop buffer that can be used as a this data sheet. Over the years and depending on the building block for AGC amplifiers, LED driver circuit, writer, the OTA section of an op amp has been integrator for fast pulse, fast control loop amplifiers, referred to as a Diamond Transistor, and control amplifiers for capacitive sensors and Voltage-Controlled Current source, Transconductor, active filters.
Are they achieving the transconductance with regular boring silicon tech (which is probably the case) or something else?
My main reason for asking the question is because its a cool part (low noise and transconductance), and because even though I suspect there is no secret sauce maybe there is, it also says ±1.2V differential input which I thought was interesting.