In this article, you will find the Circuits Analysis and Applications of Diodes, BJT, FET and MOSFET which will cover the topics such as Basics of MOSFET, Drain Current equation for Triode and Saturation Region, Operating Condition of MOSFET, MOS Transconductance, Different biasing methods of MOSFET.
There are three possible regions for the working of the MOSFET:
1. Triode Region
2. Current Saturation
Table: Operating Condition for N channel Enhancement type MOSFET.
Table: Operating Condition for P channel Enhancement type MOSFET.
Table: Operating Condition for N channel depletion type MOSFET.
Table: Operating Condition for P channel depletion type MOSFET.
There are four biasing methods for MOSFET:
1. Drain to Gate Bias Configuration
Drain to gate bias Configuration is shown below:
DC Equivalent of above circuit:
DC Analysis:
2. Voltage Divider Bias Configuration
Voltage Divider Configuration is show below:
DC Equivalent:
DC – ANALYSIS:
3. Fixed bias Configuration
Fixed bias Configuration is shown below:
DC Equivalent:
(In DC model, RG is short and input impedance is very high i.e. (IG ≃ 0))
Drawback of fixed bias: It is a dual battery design which makes it expensive and more space occupied bias Configuration.
4. Self-bias Configuration
Self Bias Configuration is shown below:
DC Equivalent:
DC ANALYSIS:
0 = VGS + IDRS
VGS = – IDRS
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