AN4304

CMRR vs. frequency

DocID024731 Rev 1

17/20

7

CMRR vs. frequency

The TSC103 current sensing device offers a very good CMRR vs. frequency (100 dB). The

common mode signal up to 200 kHz (see Figure 17: "CMRR vs. frequency"), is filtered by

the current sensing itself. However, to remove the high frequency signal, a common mode

filter must be added to the application.

Figure 17: CMRR vs. frequency

100

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100000

-120

-100

-80

-60

-40

-20

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Frequency (Hz)