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Characteristics of Common Drain Amplifier
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).
Figure: Basic N-channel MOSFET common-source amplifier with active load ID.
Figure: Small-signal circuit for N-channel MOSFET common-source amplifier.
In this case, the armature is connected in series with the field coils. Thus I a = I f = I NB. At starting, the back emf is zero (because the m
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