Practical issues using e-pot circuits

Analog VLSI circuits benefit greatly from tunable, on-chip reference voltages such as the electronic potentiometer (e-pot). This paper examines two vital features of the e-pot: the ability to hold a constant reference voltage and the capability to program it quickly. Empirical data is presented verifying long-term voltage storage, and measurements also show how quickly the e-pot may be programmed as a function of bias voltage.