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7/29/2019 Enerio - TwoStage Hands-On
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ANALOG INTEGRATED CIRCUITS
Two-Stage Amplifier
Hands-on
Submitted by:
Rey PJ A. Enerio
BSECE 4
Submitted to:
Prof. Olga Joy L. Gerasta
October 2, 2012
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Two-Stage Amplifier Model
Basic Structure
The MOSFET model is an example of a Two-Stage Amplifier. The first-stage is constructed by Mp1, Mp2, Mn3, Mn4
and a constant current source Mp5as a differential amplifier. The second-stage is constructed by Mp7 and Mn6 as a
Common Source Amplifier. The 2 NMOS at the lower left of the design is our current source.
Operational Amplifier Specification
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Step 1. Using the Operational Amplifier Specification stated above, do Design Procedure through Hand
calculations. One must determine each devices size, every FETs W/L ratio and and the current that flows
in it.
Step. 2. Design an amplifier, measuring all the important OP parameters and implement your design
using Synopsys tool.
Two-Stage Amplifier Design Symbol
The op amp uses a dual-polarity power supply (Vdd and Vss) so the ac signals can swing above and below ground
and also be centered at ground.
Vin -
Vin +
Vout
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Two-Stage Amplifier Design using Synopsys
Gain, Phase Margin, Gain Bandwidth
A two-stage amplifier must have an Open-Loop gain from 60 100 dB. To ensure that our model is stable, it must
have a phase margin from 45 degrees to 90 degrees or better yet, ensure that you reach a phase margin close to 60
degrees. Also, try to have gain bandwidth greater than 5MHz.
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Common Mode Rejection Ratio
With a two-stage amplifier, you must attain a Common Mode Rejection Ratio equal to 60-80 dB.
CMRR = Ad - Acm
Input Common Mode Range
For input common mode range, you must attain a voltage value equal to 0.7V to 3V.
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Output Voltage Swing
Power Supply Rejection Ratio
With the time allotted considering the availability of the computer access, I was able to design circuits measuring
all the important OP parameters and implemented it design using Synopsys tool. However, I was not able
to complete the analysis to give way for others to start using the Synopsys tool.
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HSpice Coding
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Describe the function of each MOSFET components.
Mp5 is a constant current source which supplie
current to the remaining part of the design.
Mp5 and Mp8 are current mirrors, at the same
time mirrored with Mp7.
(W/L)p5 = (W/L)p8 = 12
Mp1 and Mp2 is our differential side for our
inputs Vin+ and Vin-.
Since current IBD is divided into 2, thus
(W/L)p1 = (W/L)p2 = 6
Mn3 and Mn4 is a current mirror.
Since Mn3 and Mn4 is NMOS in nature, thus it
has higher mobility than PMOS. Its dimension
will be divided by 2 to 3 times to compensate
the current crossing it.
W L n3 = W L n4 = 2
IBB is our current source which in my design isequal to 2 diode connected NMOS.
Mp7 is our circuit booster, part of the second
stage of our design which is responsible in
amplifying the signal.
(W/L)p7 = 50