73M1903-IMR データシートの表示（PDF） - Teridian Semiconductor Corporation

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73M1903-IMR

Modem Analog Front End

Teridian Semiconductor Corporation 

DS_1903_032

73M1903 Data Sheet

Figure 6: Overall Receiver Frequency Response

Figure 7: Rx Passband Response

It is important to keep in mind that the receive signal should not exceed 1.16 Vpk-diff for proper

performance for Rxg=11 (0 dB). In particular, if the input level exceeds a value such that one’s density of

RBS exceeds 99.5%, sinc3 filter output will exceed the maximum input range of the decimation filter and

consequently the data will be corrupted. Also for stability reasons, the receive signal should not exceed

1.16 Vpk differentially. This value is set at around 65% of the full receive signal of 1.791 Vpkdiff at

RXAP/RXAN pins that “would” corresponds to ASDM putting out all ones.

Figure 8 and Figure 9 show the spectrum of 1 kHz tone received at RXAP/RXAN of 1.16 Vpk-diff and

0.5 kHz and 1.0 kHz tones of 0.6 Vpk-diff each, respectively for Fs=8 kHz. Note the effect of FIR

suppressing the noise above 4 kHz but at the same time enhancing (in order to compensate for the

passband droop of sinc3 filter) it near the passband edge of 4 kHz.

Rev. 2.0

19

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