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Dear Visitors and Members of Radiomuseum,

It should be mentioned that still today, in the "digital age" OpAmps (=Operational Amplifiers) are indispensable, because OpAmps are at all making it possible to digitize analog signals.
For this reason OpAmps today are produced, working with frequencies up to 10 GHz (example: OPA855 from Texas Instruments).

These were used as Analog frontend (AFE) to feed analog to digital converters (ADCs) enabling, for example, Digital direct conversion receivers.
Also higher order Filters are still realized with opamp circuits. Most of today's mobile phone chips are operating with fast OpAmps or their modern counterparts, the current conveyors, realizing On-Chip Filter functions.
Everywhere where (continuous) fast calculations of nonlinear relationships, consuming only small power, are necessary, OpAmps could still outperform microprocessors.
The term "Operational Amplifier" appeared not until the early 194