circuitking
Full Member level 5
Hi, I have connected a capacitor (C) in series with the gate of a mosfet(M, let's say a CS amplifier). It's value (180 fF) is not too high like a blocking capacitor. How does increasing or decreasing this value change the output power and lower(input) cut-off frequencies?.
My analysis is like If the C value is decreased, the Vgs of M decreased because of capacitive division. Current swing decreases and hence output power decreases. The lower cut-off frequency is also increases because the over capacitance at the input is decreased. Exactly the opposite happen when the C value is increased. Thanks
My analysis is like If the C value is decreased, the Vgs of M decreased because of capacitive division. Current swing decreases and hence output power decreases. The lower cut-off frequency is also increases because the over capacitance at the input is decreased. Exactly the opposite happen when the C value is increased. Thanks