This circuit simulates a resistor controlled by digital signals. We found it in American documentation from the 90s. The basic component is a CMOS 4016 or 4066 digital switch.
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...
This circuit is part of an article published in the March 1990 issue of Radio Electronics...
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...