For the circuit shown, the equivalent low-pass filter for the input is simply C1 in series with RG because the gate input resistance is so high. The output capacitor may be smaller or larger depending on the drain and load resistor size. Summary Effect of Coupling Capacitors With FETs, the input coupling capacitor is almost always smaller because of the high input resistance. The equivalent circuit for C1 is a high-pass filter: C3 and (RC + RL) form another high-pass filter. They affect the low-frequency response of the amplifier. Summary Effect of Coupling Capacitors Coupling capacitors are in series with the signal and are part of a high-pass filter network. E N D - Presentation TranscriptĮlectronic Devices Ninth Edition Floyd Chapter 10
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