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EE2102 Tutorial 7

The document outlines the guidelines for the use of course materials for EE2102 Analog Electronics, emphasizing copyright restrictions and prohibitions on recording lectures without permission. It also includes details on MOSFET operating modes for NMOS and PMOS transistors, along with example problems related to their operating points. Additionally, there is a reference to drawing a DC equivalent circuit for a common drain amplifier and calculating its DC operating point.

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140 views13 pages

EE2102 Tutorial 7

The document outlines the guidelines for the use of course materials for EE2102 Analog Electronics, emphasizing copyright restrictions and prohibitions on recording lectures without permission. It also includes details on MOSFET operating modes for NMOS and PMOS transistors, along with example problems related to their operating points. Additionally, there is a reference to drawing a DC equivalent circuit for a common drain amplifier and calculating its DC operating point.

Uploaded by

T28kumar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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EE2102 Analog Electronics

Tutorial 7
Assoc Prof See Kye Yak
Office: S2-B2C-112
email: ekysee@ntu.edu.sg
All course materials, including but not limited to, lecture slides, handout and recordings, are for your own educational purposes only. All the contents of
the materials are protected by copyright, trademark or other forms of proprietary rights.
All rights, title and interest in the materials are owned by, licensed to or controlled by the University, unless otherwise expressly stated. The materials
shall not be uploaded, reproduced, distributed, republished or transmitted in any form or by any means, in whole or in part, without written approval
from the University.
You are also not allowed to take any photograph, film, audio record or other means of capturing images or voice of any contents during lecture(s)
and/or tutorial(s) and reproduce, distribute and/or transmit any form or by any means, in whole or in part, without the written permission from the
University.
Appropriate action(s) will be taken against you including but not limited to disciplinary proceeding and/or legal action if you are found to have
committed any of the above or infringed the University’s copyright.
MOSFET Operating Modes
Operating Mode NMOS PMOS
VT +ve -ve
Cut-off VGS < VT VGS > VT or |VGS | < |VT |
ID = 0 ID = 0
Ohmic VGS > VT VGS < VT or |VGS | > |VT |
VDS < VGS  VT VDS > VGS  VT or |VDS | < |VGS  VT|
ID = Kn (VGS VT ‒ )VDS ID = Kp (|VGS | |VT | ‒ | |) |VDS |
Saturation VGS > VT VGS < VT or |VGS | > |VT |
VDS > VGS  VT VDS < VGS  VT or |VDS | > |VGS  VT|
ID = (VGS VT)2 ID = (|VGS | |VT |)2

2
Q1: Check the region of operation for the following circuits. Determine the
operating point if it is in saturation. Assume , and Kn = 0.5
mA/V-1 for NMOS and and Kp = 250 A/V-1 for PMOS.
+15 V

1 k

+
4V

1.6 k
1 M
3 k

15 V
(a) (b)
3
(a) Apply KVL
VDD
RD

IG  0,  =0

RG
RS
Assume the NMOS is in saturation mode:
VSS

4
Substituting (1) into (2):

+21.78=0

5
If 6.35 mA:
VDD
RD

RG
RS

It contradicts the assumption of saturation mode.


VSS

6
If mA:
VDD
RD

RG
RS
It confirms the assumption of saturation mode.

VSS

The DC operating point is )


7
(b) VSS

It confirms PMOS is not in cut-off.

Assume PMOS is in saturation:


RD

𝐺𝑆 𝑇𝑃

𝐷𝑆

𝐷𝑆 𝐺𝑆

It confirms PMOS is not in saturation. 8


(b) VSS
The PMOS must be in Ohmic mode.

𝐺𝑆

-------- (1)
RD
𝐷𝑆 ----- (2)
Substitute (2) into (1):

𝐷𝑆
V

9
Q2:Draw the DC equivalent circuit for the common drain amplifier of Figure 2.
Assume that the capacitors have infinite value, , ,
, , , , and .
calculate the DC operating point of the amplifier.

Figure 2 10
DC analysis
12
13

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