6.1. Grounded-Source Amplifier: Coupling Capacitor
A version of the circuits of Fig. 5.2, as given in Fig. 6.1, is generalized to include a resistance, Rs, as part of the input signal source. The input signal at the gate (and thus the output) will fall off for decreasing frequencies as the magnitude of reactance of the capacitor increases. The value of the capacitor is selected such that the reactance will be small compared to the value of the sum of the resistors, at the lowest operating frequency.
Figure 6.1. Circuit with coupling capacitor. Capacitor blocks the signal at low frequencies. Cg and RG = RG1 || RG2 must be selected for | XCg | <<Rs + RG at the gain measurement frequency.
In this amplifier, all the gain-frequency dependence ...
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