DESIGN EQUIVALENT CIRCUIT HIGH-PASS FILTER FOR CIRCUIT BROADBAND CMOS FREQUENCY TRIPLE USING MENTOR GRAPHICS

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DESIGN EQUIVALENT CIRCUIT HIGH-PASS FILTER FOR
CIRCUIT BROADBAND CMOS FREQUENCY TRIPLE USING
MENTOR GRAPHICS

• Veronica Ernita Kristianti

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Outlines

• 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
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Output Original Circuit Broadband CMOS Frequency
Tripler

• (a) Simulated/measured input waveform. (b)
  Simulated output waveform. (c) Measured output
  waveform. 18

• (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

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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 High-pass 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
  High-pass 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