关键词: phase-shift, op amp, operational amplifier, DS1669, phase control, opamps, digipots, digital potentiometers, epots, digital pot
Abstract: This application brief describes how to control analog phase shift digitally using a combination of digital potentiometers and standard operational amplifiers (op amps). It is intended to serve as a design example for engineers needing to implement digital phase shift in a circuitry with no specific application. It presents common op amp phase shift configurations and how to implement them using a digital potentiometer in place of mechanical potentiometers or fixed resistors. Formulas for calculating phase shift are included in the application note.
Digitally-Controlled Phase Shift Using the DS1669.pdf 
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