Double gate field effect transistor high frequency amplifier circuit

Double-gate field effect transistors are also called double-gate MOS transistors. One tube has two control gates. From a structural point of view, it can be considered to be
composed of two single-gate field effect transistors connected in series. From a characteristic point of view, since the second gate G2 has
a certain shielding effect, the feedback capacitance between the drain and the first gate becomes Very small.
    Figure 21-17 shows a
dual-gate field effect transistor high-frequency amplifier with automatic gain control in a color TV high-frequency tuner .
  The reference values ​​of component parameters are as follows:
  1) Transistor: VT is a double-gate CMOS tube.