Synthesize Variable Resistors With Hyperbolic Taper

摘要

In adjustable, frequency-selective RC networks, the reciprocal of an RC product, ω_c= 1/RC, determines the corner frequencies of the network. If the adjustable elements are potentiometers with a linear-control characteristic-that is, taper-R(α)=αR_p, where a is the normalized wiper position, 0≤α≤1, and R_p is the potentiometer's end-to-end resistance, then the corner frequencies are reciprocal functions of the potentiometer's wiper position, and the frequency scale compresses at the high end of the adjustment range.