參數(shù)資料
型號: Z87200
廠商: ZILOG INC
元件分類: 通信及網(wǎng)絡
英文描述: CAP 0.047UF 100V 10% X7R AXIAL TR-14
中文描述: SPECIALTY TELECOM CIRCUIT, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 45/54頁
文件大?。?/td> 449K
代理商: Z87200
Z87200
Zilog
Spread-Spectrum Transceiver
DS96WRL0400
4-45
4
The choice of the I.F. frequency and sampling rate is cru-
cial so that the unwanted alias of the signal in the base-
band Nyquist region lies as far as possible from the de-
sired signal to permit maximum attenuation. The optimum
separation of the desired signal and the unwanted alias oc-
curs when the alias is centered at the bounds of the base-
band Nyquist region, | f | =1/2 f
SA
as shown in Figure 14.
In this case, the desired signal is equally spaced from the
unwanted aliases in both the positive and negative fre-
quency domains and f1 = 1/4 f
SA
. Consider, then, the worst
case appropriate for Direct I.F. Sampling Mode. If B<1/4
f
SA
as has been said to be appropriate for Direct I.F. Sam-
pling Mode, then N=f
SA
/B=4, the break frequency is
3 /8 f
SA
or greater, and the attenuation provided by the In-
tegrate and Dump filter is given by the curve of Figure 13
for values of (N f/f
SA
) greater than 3/2. Here, the attenua-
tion is at least ~21 dB, offering much better attenuation of
the unwanted alias than in the previous worst case exam-
ple. Further analysis shows that if the input SNR is 15 dB,
then the alias attenuated by 21 dB will reduce the SNR by
approximately 1 dB.
Figure 13. G(
ω
) = dom (
ω
’)/
ω
’, where
ω
’ = (2
π
Nf)/f
SA
Figure 14. Optimum Condition for Bandpass Sampling
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