AN2451 datasheet(28/55 Pages) STMICROELECTRONICS

28 / 55 page

Board description

AN2451

28/55

Doc ID 12791 Rev 3

Figure 21.

Measured BER vs. SNR curve (typical), white noise

For narrow-band interference tests, two types of interfering noise have been used: a pure

sinusoidal tone and an amplitude-modulated signal (modulating signal 1 kHz, modulation

depth 80%). In both cases, the amplitude of the noise signal (of the carrier, for modulated

signal) has been decreased until the measured BER was lower than 10-3 (one error every

1000 transmitted bits).

Figure 22 shows SNR vs. frequency curves for both a pure sinusoidal and an AM modulated

interferer.

Figure 22.

SNR vs. frequency curve (typical) at BER = 10-3

BER vs. Signal to Noise Ratio

1.00E-06

1.00E-05

1.00E-04

1.00E-03

1.00E-02

1.00E-01

6.0

7.0

8.0

9.0

10.0

11.0

12.0

13.0

14.0

15.0

16.0

17.0

18.0

S/N

S/N @ CISPR

S/N @ Rx_IN

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

100

110

120

frequency [kHz]

No modulation

AM 1kHz 80%

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