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SZNUF8152 Folha de dados(PDF) 5 Page - ON Semiconductor |
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SZNUF8152 Folha de dados(HTML) 5 Page - ON Semiconductor |
5 / 6 page NUF8152, SZNUF8152 http://onsemi.com 5 Table 2. Frequency Chart Bandwidth Maximum Supported Frequency Third Harmonic Frequency 3 dB – 100 MHz 33.33 MHz (f1) 100 MHz 6 dB – 200 MHz 66.67 MHz (f2) 200 MHz 9 dB – 300 MHz 100 MHz (f3) 300 MHz Considering that 85% of the amplitude of the square is in the first two terms of the Fourier series approximation most of the signal content is at the fundamental (maximum supported) frequency and the third harmonic frequency. If a signal with a frequency of 33.33 MHz is input to this filter, the first two terms are sufficiently passed such that the signal is only mildly affected, as is shown in Figure 6a. If a signal with a frequency of 66.67 MHz is input to this same filter, the third harmonic term is significantly attenuated. This serves to round the signal edges and skew the waveform, as is shown in Figure 6b. In the case that a 100 MHz signal is input to this filter, the third harmonic term is attenuated even further and results in even more rounding of the signal edges as is shown in Figure 6c. The result is the degradation of the data being transmitted making the digital data (1’s and 0’s) more difficult to discern. This does not include effects of other components such as interconnect and other path losses which could further serve to degrade the signal integrity. While some filter products may specify the 6 dB or 9 dB bandwidths, actually using these to calculate supported frequencies (and corresponding data rates) results in significant signal degradation. To ensure the best signal integrity possible, it is best to use the 3 dB bandwidth to calculate the achievable data rate. Figure 6. Input and Output Waveforms of Filter Input Waveform Output Waveform Input Waveform Output Waveform Input Waveform Output Waveform a) Frequency = f1 b) Frequency = f2 c) Frequency = f3 |
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