This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating amplifiers with the same characteristics and the power supply must be symmetrical.
We found this circuit in an old publication. The circuit can be implemented with modern equivalent...
This circuit has more sensitivity than the previous one (CB4114E) for using a full-wave detector...
This circuit was originally designed for communications applications. We found it in a 1980s...