Duak-Gate MOSFETS in TV if Amplifiers

The design of a dual gate MOSFET amplifier is, in theory, simpler than that of a bipolar amplifier because of the very low feedback associated with the dual gate device. When feedback is low enough to be neglected, the input impedance Zi= 1/Y11; the output impedance Zo = 1/Y22; and the voltage gain Vo/Vi = Y21RL, where RL is the total parallel resistance across the output tuned circuit, and includes ReY22.