DESIGN EQUIVALENT CIRCUIT HIGH-PASS FILTER FOR CIRCUIT BROADBAND CMOS FREQUENCY

TRIPLE USING MENTOR GRAPHICS

Veronica Ernita Kristianti

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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• 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.

Research Methods

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Result and Analysis

Original Circuit Broadband CMOS Frequency Tripler [18]

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(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]

Output Original Circuit Broadband CMOS Frequency Tripler

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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

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