This is a precision half-wave rectifier, suggested by Texas Instruments. Diodes are commonly used, and resistors can have signal values. The power supply must be symmetrical.
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...