Download DESIGN EQUIVALENT CIRCUIT HIGH

DESIGN EQUIVALENT CIRCUIT HIGH-PASS FILTER
FOR CIRCUIT BROADBAND CMOS FREQUENCY
TRIPLE USING MENTOR GRAPHICS
Veronica Ernita Kristianti
Outlines
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Background
Problem Definitions
Research Methods
Result and Analysis
Conclusion
Future Work
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Background
• Currently, Complementary Metal Oxide System (CMOS)
technology are widely used in many kinds of applications,
– e.g. "A Broadband CMOS Frequency Tripler Using a Third-Harmonic
Enhanced Technique" [18].
• Implementation of Broadband CMOS Frequency Tripler:
Figure 1.1: Block Diagram Implementation Circuit that uses
CMOS Technology
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Background
• High-pass filter used in the previous series is LC filter.
In designing the filter, the use of inductor (L) are
sometimes avoided:
– the size is huge
– the production cost is high
• So, it is important to have equivalent circuit design
of high-pass filter LC.
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Problem Definitions
• What does the equivalent circuits high-pass filter LC
look like?
• What is the result of circuit simulation after the LC
high-pass filter series is substituted with the similar
LC high-pass filter using software Mentor Graphics?
• Is there any differences between the circuit
simulation results before and after the LC high-pass
filter series are substituted with the similar
sequences?
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Research Methods
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Research Methods
• Study of literature: to investigate the suitable values of
nMOS and pMOS in establishing CMOS.
• investigate value of parameters of other component such
as capacitor, inductor, and resistor.
• Design:
– Input Stage,
– Nonlinear Combiner,
– High-pass Filter,
– output Buffer,
 combining series that has been designed.
• For each design, I always perform simulation using Mentor
Graphics so that the output of each design can be checked
its validity.
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Result and Analysis
Original Circuit Broadband CMOS Frequency Tripler [18]
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Output Original Circuit Broadband CMOS Frequency Tripler
(a) the input fundamental waveform V1, (b)
the inverted waveform V2, and (c) the
nonlinear combination of the input
waveform and the inverted waveform.[18]
(a) Simulated/measured input waveform. (b)
Simulated output waveform. (c) Measured
output waveform. [18]
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Circuit Broadband CMOS Frequency Tripler Using High-pass Filter LC
in Mentor Graphic
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Voltage Output
Current Output
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Analysis
• High-pass filter LC gave the same voltage output
and current output as expected:
– Using L = 15 nH and C2 = C3 = C = 10 pF, with NMOS and
PMOS to Ln = Lp = 0.35 μm, Wn = Wp = 0.4 μm.
• For other parameters, the results are less
appropriate.
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Circuit Broadband CMOS Frequency Tripler Using High-pass Filter LC
(L is replaced by Spiral Inductor)
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Voltage Output
Current Output
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Analysis
• If L is replaced by spiral inductor gave the
same voltage output and current output as
expected:
– Using C2 = C3 = 10 pF, with NMOS and PMOS to Ln
= Lp = 0.35 μm, Wn = Wp = 0.4 μm.
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Circuit Broadband CMOS Frequency Tripler
Using High-pass Filter RC
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Voltage output
Current output
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Analysis
• By replacing high-pass filter LC with RC: resulted
voltage output and current output are the same.
• Using C1 = C2 = C3 = C4 = 1 uF and R1 = R2 = R3 = 4.3 ohm,
with NMOS and PMOS to Ln = Lp = 0.35 μm, Wn = 0.69 μm,
Wp = 2.97 μm
• Inverter 2 should be equal to 4 times of inverter 1. (Other
combination values of inverter 1 and 2 will give
unexpected results).
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Conclusion (1)
• Because of its size, the use of inductor is often
avoided on filter designs. On the other hand,
inductors are very important in obtaining noiseless
current and voltage. Therefore, it is very important to
find substitute for such inductors. A series of Highpass filter RC (without inductor) is one candidate of
a substitute for a series of High-pass filter LC (with
inductor).
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Conclusion (2)
• Experiment results show that a series of Highpass filter RC can be used as a substitute for a
series of High-pass filter LC.
– Because the size of RC is much smaller than
LC, RC will need less cost than LC. Thus, the
cost of production can be pressed.
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Conclusion (3)
• However, the experiment results also show
that, output quality of high-pass filter LC
(either as inductor active or as spiral inductor)
is still better than RC .
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Future Work
Designing a better High-pass filter RC, with a
better quality of output
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Thank You
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