=========================preview======================
(ELEC304)Supplementary.pdf
Back to ELEC304 Login to download
======================================================
ELEC304 C Approved Supplementary for Final Exam
Shortcuts of Zero-Value Time Constant Method
1. BJT Common-Emitter Configuration
For C: R= r // RS
For C: R= r // RS + RL + gmRL .(r // RS )
Emitter-Follower Configuration
RS + RL

For C: R = r //
1+ gmRL

2. MOSFET Common-Source Configuration
For Cgs, Rgs = RS
For Cgd, Rgd = RS + RL + gmRLRS
Source-Follower Configuration
R + R

For Cgs, Rgs = SL
1+ gmRL

3. Important Result
C C
RS

vi


vo
RS//Rin
-GmRo






From the result of common-emitter configuration, the resistance seen by C, which is denoted as RC, is given by RC = RS // Rin + Ro + GmRo .(RS // Rin ) It is important to note that C is connected between the amplifier input and output.