6.2. Current-Source Bias Amplifier: Bypass Capacitor
The PMOS common-source amplifier circuit with the bypass capacitor is shown in Fig. 6.2. At some low frequency, the effect of the capacitor is absent, and the gain is computed from (5.15), which is
Figure 6.2. Dual-power-supply common-source amplifier stage with bypass capacitor. The object is to determine the frequency for which the source is effectively at signal ground.
Over a range of frequencies, the gain evolves from (5.15) to (5.2), av = –gmRD (neglecting the output resistance of ...
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