From above figure, it has two RC networks that affect its gain as the frequency is reduced below midrange.

**Low frequency analysis of FET
amplifier****:**

From
above figure, it has two RC networks that affect its gain as the frequency is
reduced below midrange. These are,

1. RC
network formed by the input coupling capacitor C_{1} and input
impedance of the amplifier.

2. RC
network formed by the output coupling capacitor and the output impedance
looking in at the drain.

`**Input RC network:**

Lower
critical frequency of this network is given as,

The value
of R_{in}(gate) can be determined from the data sheet as follows:

The phase
shift in low frequency input RC circuit is θ = tan^{-1} (X_{C1}
/ R_{in} )

**Output RC network:**

Lower
critical frequency of this network is given as,

The phase
shift in low frequency output RC circuit is θ = tan^{-1} (X_{C2}
/ R_{D} + R_{L})

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Electronic Circuits - Frequency Analysis of BJT and MOSFET Amplifiers : Low frequency analysis of FET amplifier |

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