AN3213 datasheet(28/64 Pages) STMICROELECTRONICS

Part #	AN3213

Description	ST7570 S-FSK power line networking system-on-chip

PDF	64 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

28 / 64 page

ST7570 demonstration board description

AN3213

28/64

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

AN3213 Datasheet(PDF) 28 Page - STMicroelectronics