The Cathode Follower Driven by a Rectangular Voltage Wave

A rectangular voltage wave is often transmitted from a high-impedance source to a low-impedance load through resistancecapacitance coupling and a cathode follower. The position of the grid-return tap on the cathode resistor determines, for any applied voltage wave form, whether the output voltage wave is linearly related to the input voltage wave or is affected by cutoff or by overdriving. This paper presents methods for determining the operating condition that applies and derives expressions for the circuit voltages, subject to stated assumptions.