add a common-drain (voltage-follower) stage between the driver and the common-source stage so the Thévenin resistance of the combined driver plus voltage follower is less than the RA of the original driver. Examination of the output side of the circuit in Figure 2 enables the frequency dependence of the gain vD / vG to be found, providing a check that the low-frequency evaluation of the Miller capacitance is adequate for frequencies f even larger than f3 dB. (See article on pole splitting to see how the output side of the circuit is handled.) See also Miller effect Pole splitting Common gate Common drain Common base Common emitter Common collector References External links Common-Source Amplifier Stage Single-stage transistor amplifiers