Noise Suppression Examples in Mobile Communications
BaseBand in Cellular Phone
Cellular Phone Technical Trend
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Noise of Power Supply Lines
Radiation Noise from the flexible PCB, which generated in baseband
ICs operate at high-speed, so high frequency and high level noise geneate. This type of noise may radiate through conducting to the flexible PCB and affect a antenna block.
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Measurement Result
Mapping of Radiation Noise (GSM band) from the flexible PCB with the EMI tester
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Introduction of NFM18PC Series
- smallest size in the industry (1.6x0.8mm)
- Three terminal structure with low residual (ESL)* realize large insertion loss characteristics over wide frequency range.
*Not exceeding one-tenth of Monolithic Ceramic Capacitors (two terminal).
(in: mm)
| Part Number |
Capacitance
(µF) |
Tolerance
(%) |
Insulation Resistance
(MΩ min.) |
Rlated Voltage
(VDC) |
Rated Current
(A) |
Operating
Temperature Range |
| NFM18PC104R1C3 |
0.1 |
M: ±20 |
1000 |
16 |
2 |
-55 to 125°C |
| NFM18PC224R0J3 |
0.22 |
6.3 |
| NFM18PC474R0J3 |
0.47 |
| NFM18PC105R0J3 |
1 |
500 |
4 |
-55 to 105°C |
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Examination with production version (Power Supply Lines)
We have evaluated to improve the error rate performance using cellular phone (production version)
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Voltage Spectrum
Comparison of Voltage Spectrum
- Without EMI Filter
- Existing capacitaor (27pF)
- Three-terminals Capacitor: NFM18PC105R0J3 (1µF)
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Improvement of Error Rate Performance
RF level record of Error Rate exceeding 0%
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Noise Suppression Examples in Mobile Communications
