schmitt trigger
Advanced Member level 5
This is more a question along the lines of curiosity, and to have a friendly chat with fellow engineers, nothing else.
I come a looong way, over 40 years, using monolithic opamps. I first started with externally compensated, unprotected output, limited CMR devices like the uA709. I remember when I first used the uA741: internally compensated, short circuit proof, an engineering marvel! And nowadays it looks soooooooooo antiquated.
Back then state of the art meant a fully bipolar device.
There were thereafter a major technology leap, with incredibly improved characteristics. These used mixed process devices, either BiCMOS or BiJFet processes. The first exemplified with the CA3140 and the latter with the TL07x series.
I know that nowadays there are many, full CMOS opamps. Some of them with quite impressive specs.
But, what is the state of the art? For a truly high performance opamp, are mixed process devices still required??
Unfortunately the datasheets no longer provide the amount of information that was available in the 70s and 80s, where even an internal device schematic, along with a detailed discussion was provided.
I come a looong way, over 40 years, using monolithic opamps. I first started with externally compensated, unprotected output, limited CMR devices like the uA709. I remember when I first used the uA741: internally compensated, short circuit proof, an engineering marvel! And nowadays it looks soooooooooo antiquated.
Back then state of the art meant a fully bipolar device.
There were thereafter a major technology leap, with incredibly improved characteristics. These used mixed process devices, either BiCMOS or BiJFet processes. The first exemplified with the CA3140 and the latter with the TL07x series.
I know that nowadays there are many, full CMOS opamps. Some of them with quite impressive specs.
But, what is the state of the art? For a truly high performance opamp, are mixed process devices still required??
Unfortunately the datasheets no longer provide the amount of information that was available in the 70s and 80s, where even an internal device schematic, along with a detailed discussion was provided.