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AN4444 Datasheet(PDF) 33 Page - STMicroelectronics

Part # AN4444
Description  ST7590 PRIME compliant power line networking SoC design guide
PDF  68 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4444 Datasheet(HTML) 33 Page - STMicroelectronics

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AN4444
ST7590 reference design description
68
Reception optional amplifier
An additional all-pass amplifier has been included as an option to extend the dynamic range
of the communication.
The gain of the external amplifier only (to be combined with the reception passive filter
response) can be calculated as:
Equation 7
This extra gain could lead to ST7590 Rx input stage saturation if the input signal is very
strong. In that case, an automatic algorithm has been implemented to attenuate the input
signal. This attenuation can be calculated as:
Equation 8
Figure 22 and Figure 23 report the measured frequency response in amplification and
attenuation cases, compared with the passive filter response. Figure 24 and Figure 25 show
the result of Montecarlo simulation for the same cases.
Figure 22. Measured frequency response of the reception external amplifier + passive filter
(higher curve) vs. reception passive filter only (lower curve)
dB
10.9
=
3.5
39
36
38
R
R
R
G
RX
dB
0
99
.
0
//
//
//
40
36
39
38
40
36
39
40
36
R
R
R
R
R
R
R
R
R
G
RX



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