Characteristics of common drain amplifier, Electrical Engineering

Characteristics of Common Drain Amplifier

1575_Characteristics of Common Drain Amplifier 1.png

                               Figure: Basic N-channel JFET source follower circuit (neglecting biasing details).

Voltage gain:

AV = Uout / Uin = gmRs/gmRs + 1 ≈ (gmRs >> 1)

Current gain:

Ai =

Input impedance:

rin =

Output impedance: 

(The parallel notation A||B points out the impedance of components A and B that are connected in parallel)

rout = RS || 1/ gm

= (Rs/ gm) / (Rs + (1/ gm))


 = Rs / gm Rs+1 ≈ 1/ gm (gm Rs >> 1)

The variable gm that is not listed in Figure is the transconductance of the device (generally given in units of siemens).

1918_Characteristics of Common Drain Amplifier 2.png

                                       Figure: Basic N-channel MOSFET common-source amplifier with active load ID.

682_Characteristics of Common Drain Amplifier 3.png

                                      Figure: Small-signal circuit for N-channel MOSFET common-source amplifier.

Posted Date: 1/11/2013 2:01:12 AM | Location : United States

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