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AN3213 データシート(PDF) 28 Page - STMicroelectronics

部品番号 AN3213
部品情報  ST7570 S-FSK power line networking system-on-chip
PDF  64 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3213 データシート(HTML) 28 Page - STMicroelectronics

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ST7570 demonstration board description
AN3213
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Doc ID 17429 Rev 1
Simulation of the Tx active filter response against component tolerance, depicted in
Figure 18, shows +/-1 dB variation in gain module within the signal bandwidth, while the Q
variation is more sensitive around 100 kHz.
Figure 18.
Montecarlo simulation of the transmission active filter frequency
response
7.1.2
Reception passive filter
The reception filter is made up of the series of a resistor and a parallel L-C resonant. The
transfer function of the filter can be written as:
Equation 5
Where
RL is the DC series resistance of the inductor (in this case, about 2 Ω)
C‘1 is the parallel of C1 with the reverse capacitance of the transil diode D3, which is
about 2 nF.
The center frequency and the quality factor of the filter can be expressed as:
Equation 6
Equation 7



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