Both the operational amplifier and the diodes admit equivalents in this circuit suggested by National Semiconductor. The power source must be symmetrical, and the circuit curve resembles an ideal diode.
This low-noise, low-drift amplifier was found in a 90's EDN. It can be implemented with modern...
June 2016 - can already be obtained from the Mouser the Texas Instruments DRV10964 along with...
This circuit was obtained in the 1977 RCA CMOS manual. The circuit has the frequencies determined by the...