12.5 Common Source Amplifiers

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Presentation transcript:

12.5 Common Source Amplifiers vin? vo? Voltage gain Av=vo/ vin?

Common-Source Amplifiers C1 and C2 are coupling capacitors and Cs is the bypass capacitor. The capacitors are intended to have large impedances for the dc signal and very small impedances for the ac signal.

Common-Source Amplifiers For DC analysis, the capacitors are replaced by open circuits to determine the quiescent operation point (Q point). The transconductance gm for the small-signal equivalent circuit is also determined. For AC analysis, the capacitor are replaced by short circuits to determine the ac voltage gain Av=vo/vin.

DC Analysis DC voltage sources Coupling capacitors Bypass capacitors

The Small-Signal Equivalent Circuit In small-signal midband analysis of FET amplifiers, the coupling capacitors, bypass capacitors, and dc voltage sources are replaced by short circuits. The FET is replaced with its small-signal equivalent circuit. Then, we write circuit equations and derive useful expressions for gains, input impedance, and output impedance.

AC Analysis DC voltage sources Coupling capacitors Bypass capacitors

DC voltage sources Coupling capacitors Bypass capacitors

SMALL-SIGNAL EQUIVALENT CIRCUITS (12.4) A more complex equivalent circuit consider drain resistance rd

Common Source Amplifiers: FET source 端接ground

Common Source Amplifiers: Equivalent load resistance Input voltage & output voltage Voltage Gain

Common Source Amplifiers: Input Resistance Output resistance disconnect the load, replace the signal source by the internal resistance, find the resistance by looking into the output terminals.

Example 12.4 Analyze the following circuit. KP=50uA/V2, Vto=2 V, L=10um, W=400um (identical to example 12.2). Assume Find midband voltage gain input resistance output resistance output voltage

Example 12.4 Analyze the following circuit. KP=50uA/V2, Vto=2 V, L=10um, W=400um (identical to example 12.2). DC Analysis Fine Q point (see example 12.2)

Example 12.4 Analyze the following circuit. KP=50uA/V2, Vto=2 V, L=10um, W=400um (identical to example 12.2). AC Analysis Fine gm(see Ch 12.4) Equivalent load resistance ( ) Voltage Gain

Example 12.4 Analyze the following circuit. KP=50uA/V2, Vto=2 V, L=10um, W=400um (identical to example 12.2). Input Resistance Output Resistance Input voltage Output voltage