1. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
The Impedance Matching in The Audio Signal Processing
Umar Sidik.BEng.MSc*
Director of Engineering
Electronusa Mechanical System (CTRONICS)
*umar.sidik@engineer.com
1. Introduction
Commonly, impedance is obstruction to transfer energy in the electronic circuit. Therefore, the
impedance matching is required to achieve the maximum power transfer. Furthermore, the
impedance matching equalizes the source impedance and load impedance. In other hand, the
emitter-follower (common-collector) provides the impedance matching delivered from the base
(input) to the emitter (output). The emitter-follower has high input resistance and low output
resistance. In the emitter-follower, the input resistance depends on the load resistance, while the
output resistance depends on the source resistance. In addition, this study implements the radial
electrolytic capacitor 220݊‫. ܸ36⁄ ܨ‬
2. Analytical Work
In this study, ܴଵ and ܴଶ form the Thevenin voltage, while ‫ܥ‬ଵ and ‫ܥ‬ଶ deliver ac signal as ‫ݒ‬௜௡ and
‫ݒ‬௢௨௧ (figure 1).
(a) (b)
Figure 1. (a). The concept of circuit analyzed in the study
(b). The equivalent circuit
2.1 Analysis of dc
First step, we have to calculate the Thevenin’s voltage in figure 1:
ܴଶ
்ܸு ൌ ൈ ܸ஼஼
ܴଵ ൅ ܴଶ
For this circuit, ܸ஼஼ is 5ܸ, then:
24݇Ω
்ܸு ൌ ൈ 5ܸ
10݇Ω ൅ 24݇Ω
24݇Ω
்ܸு ൈ 5ܸ
34݇Ω
்ܸு ൌ ሺ0.71ሻ ൈ 5ܸ
்ܸு ൌ 3.55ܸ
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2. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
Actually, in this circuit ்ܸு ൌ ܸ஻ , so ܸ஻ ൌ 3.55ܸ.
The second step, we have to calculate ܸா :
ܸா ൌ ܸ஻ െ ܸ஻ா
ܸா ൌ 3.55ܸ െ 0.7ܸ
ܸா ൌ 2.85ܸ
The third step, we have to calculate ‫ܫ‬ா :
ܸா
‫ܫ‬ா ൌ
ܴா
2.85ܸ
‫ܫ‬ா ൌ
150Ω
‫ܫ‬ா ൌ 19݉‫ܣ‬
2.2 Analysis of ac
In the analysis of ac, we involve the capacitor to pass the ac signal and we also involve the internal
resistance of emitter known as ‫ݎ‬௘ (figure 2).
(a) (b)
Figure 2. (a). The ac circuit
(b). The equivalent circuit for ac analysis
The first step, we have to calculate ‫ݎ‬௘ in the figure 2:
25݉‫ݒ‬
‫ݎ‬௘ ൌ
‫ܫ‬ா
25ܸ݉
‫ݎ‬௘ ൌ
19݉‫ܣ‬
‫ݎ‬௘ ൌ 1.32Ω
The second step, we have to calculate ‫ݎ‬௜௡ሺ௕௔௦௘ሻ :
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺߚ ൅ 1ሻ൫ሺܴଷ ൅ ܴସ ሻԡ‫ݎ‬௘ ൯
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ200 ൅ 1ሻ൫ሺ150Ω ൅ 8.2Ωሻԡ1.32Ω൯
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3. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ201ሻ൫ሺ158.2Ωሻԡ1.32Ω൯
1 1
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ201ሻ ൬ ൅ ൰
158.2Ω 1.32Ω
1.32 158.2
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ201ሻ ൬ ൅ ൰
208.824Ω 208.824Ω
159.52
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ201ሻ ൬ ൰
208.824Ω
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ ሺ201ሻሺ0.764Ωሻ
‫ݎ‬௜௡ሺ௕௔௦௘ሻ ൌ 153.564Ω
The third step is to calculate ݅௕ :
‫ݒ‬௜௡
݅௕ ൌ
‫ݎ‬௜௡ሺ௕௔௦௘ሻ
1ܸ݉
݅௕ ൌ
153.564Ω
݅௕ ൌ 0.0065݉‫ܣ‬
݅௕ ൌ 6.5ߤ‫ܣ‬
The fourth step is to calculate ݅௖ :
݅௖ ൌ ߚ݅௕
݅௖ ൌ ሺ200ሻሺ0.0065݉‫ܣ‬ሻ
݅௖ ൌ 1.3݉‫ܣ‬
The last step is to calculate ‫ݒ‬௢௨௧ :
‫ݒ‬௢௨௧ ൌ ݅௖ ‫ݎ‬௢௨௧
‫ݒ‬௢௨௧ ൌ ሺ1.3݉‫ܣ‬ሻሺ0.764Ωሻ
‫ݒ‬௢௨௧ ൌ 0.9932ܸ݉
‫ݒ‬௢௨௧ ൌ 993.2ߤܸ
3. Simulation Work
The simulation work can be classified into the dc analysis and the ac analysis.
3.1 Analysis of dc
In the simulation, ்ܸு is 3ܸ (figure 3), while in the analytical work ்ܸு is 3.55ܸ.
The different of the analytical work and the simulation work is:
்ܸுሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ்ܸுሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
்ܸுሺ௔௡௔௟௬௧௜௖௔௟ሻ
3.55ܸ െ 3ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
3.55ܸ
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4. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
0.55ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
3.55ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 18.33%
Figure 3. ்ܸு in the simulation
In the simulation, ܸா is 2.25ܸ (figure 4), while in the analytical work ܸா is 2.85ܸ. The different of the
analytical work and the simulation work is:
ܸாሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ܸாሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
ܸாሺ௔௡௔௟௬௧௜௖௔௟ሻ
2.85ܸ െ 2.25ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
2.85ܸ
0.6ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
2.85ܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 21.05%
Figure 4. ܸா in the simulation
In the simulation, ‫ܫ‬ா is 15݉‫( ܣ‬figure 5), while in the analytical work ‫ܫ‬ா is 19݉‫ .ܣ‬The difference is:
‫ܫ‬ாሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ܫ‬ாሺ௦௜௠௨௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ܫ‬ாሺ௔௡௔௟௬௧௜௖௔௟ሻ
19݉‫ ܣ‬െ 15݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
19݉‫ܣ‬
4݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
19݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 21.05%
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5. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
Figure 5. ‫ܫ‬ா in the simulation
3.2 Analysis of ac
In the analytical ݅௕ is 6.5ߤ‫ܣ݉5600.0( ܣ‬ሻ, while in the simulation ݅௕ is 0.07݉‫( ܣ‬figure 6). The
difference is:
݅௕ሺ௦௜௠௨௟௔௧௜௢௡ሻ െ ݅௕ሺ௔௡௔௟௬௧௜௖௔௟ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௕ሺ௦௜௠௨௟௔௧௜௢௡ሻ
0.07݉‫ ܣ‬െ 0.0065݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
0.07݉‫ܣ‬
0.0635
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
0.07
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 90.71%
(a) (b) (c)
(d) (e)
Figure 6. (a). ݅௕ in the simulation at 1Hz
(b). ݅௕ in the simulation at 10Hz
(c). ݅௕ in the simulation at 100Hz
(d). ݅௕ in the simulation at 1kHz
(e). ݅௕ in the simulation at 10kHz
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6. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
In the simulation, ݅௖ is 14.9݉‫( ܣ‬figure 7), while in the analytical ݅௖ is 1.3݉‫ .ܣ‬The difference is:
݅௖ሺ௦௜௠௨௟௔௧௜௢௡ሻ െ ݅௖ሺ௔௡௔௟௬௧௜௖௔௟ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௖ሺ௦௜௠௨௟௔௧௜௢௡ሻ
14.9݉‫ ܣ‬െ 1.3݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
14.9݉‫ܣ‬
13.6݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
14.9݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 91.275%
(a) (b) (c)
(d) (e)
Figure 7. (a). ݅௖ in the simulation at 1Hz
(b). ݅௖ in the simulation at 10Hz
(c). ݅௖ in the simulation at 100Hz
(d). ݅௖ in the simulation at 1kHz
(e). ݅௖ in the simulation at 10kHz
In the simulation, ݅௢௨௧ is 0ߤ‫ ܣ‬at 1Hz, is 0ߤ‫ ܣ‬at 10Hz, is 0.05ߤ‫ ܣ‬at 100Hz, is 0.94ߤ‫ ܣ‬at 1kHz, 9.61ߤ‫ ܣ‬at
10kHz, and 15.2ߤ‫ ܣ‬at 16kHz (figure 8). The difference is:
For 1Hz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 0ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3݉‫ ܣ‬െ 0݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 100%
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7. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
For 10Hz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 0ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3݉‫ ܣ‬െ 0݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
1.3݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 100%
For 100Hz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 0.05ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3000݉‫ ܣ‬െ 0.00005݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
1.29995݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 99.996%
For 1kHz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 0.94ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3000݉‫ ܣ‬െ 0.00094݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
1.29906݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 99.927%
For 10kHz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 9.61ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3000݉‫ ܣ‬െ 0.00961݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
1.29039݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
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8. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 99.26%
For 16kHz,
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ݅௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
݅௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
1.3݉‫ ܣ‬െ 15.2ߤ‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3݉‫ܣ‬
1.3000݉‫ ܣ‬െ 0.0152݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
1.2848݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
1.3000݉‫ܣ‬
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 98.83%
(a) (b) (c)
(d) (e) (f)
Figure 8. (a). ݅௢௨௧ in the simulation at 1Hz
(b). ݅௢௨௧ in the simulation at 10Hz
(c). ݅௢௨௧ in the simulation at 100Hz
(d). ݅௢௨௧ in the simulation at 1kHz
(e). ݅௢௨௧ in the simulation at 10kHz
(f). ݅௢௨௧ in the simulation at 16kHz
In the simulation, ‫ݒ‬௢௨௧ is 0ߤܸ at 1Hz, is 0ߤܸ at 10Hz, is 0.32ߤܸ at 100Hz, is 5.36ߤܸ at 1kHz, is 53.8ߤܸ
at 10kHz, and 85.3ߤܸ at 16kHz (figure 9). The difference is:
For 1Hz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 0ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 100%
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9. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
For 10Hz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 0ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 100%
For 100Hz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 0.32ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
992.88ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 99.967%
For 1kHz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 5.36ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
987.83ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 99.459%
For 10kHz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 53.8ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
939.4ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 94.583%
For 16kHz,
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ െ ‫ݒ‬௢௨௧ሺ௦௜௠௨௟௔௧௜௢௡ሻ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
‫ݒ‬௢௨௧ሺ௔௡௔௟௬௧௜௖௔௟ሻ
993.2ߤܸ െ 85.3ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
907.9ߤܸ
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ ൈ 100%
993.2ߤܸ
9|Page

10. Electronusa Mechanical System [Research Center for Electronic and Mechanical]
ሺ%ሻ݂݂݀݅݁‫ ݁ܿ݊݁ݎ‬ൌ 91.41%
In this study, the simulation shows that the ݅௢௨௧ and ‫ݒ‬௢௨௧ became stable started at 1 kHz.
(a) (b) (c)
(d) (e) (f)
Figure 9. (a). ‫ݒ‬௢௨௧ in the simulation at 1Hz
(b). ‫ݒ‬௢௨௧ in the simulation at 10Hz
(c). ‫ݒ‬௢௨௧ in the simulation at 100Hz
(d). ‫ݒ‬௢௨௧ in the simulation at 1kHz
(e). ‫ݒ‬௢௨௧ in the simulation at 10kHz
(f). ‫ݒ‬௢௨௧ in the simulation at 16kHz
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