參數(shù)資料
型號(hào): Z87200
廠商: ZILOG INC
元件分類: 通信及網(wǎng)絡(luò)
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): 52/54頁
文件大?。?/td> 449K
代理商: Z87200
Z87200
Spread-Spectrum Transceiver
Zilog
4-52
DS96WRL0400
THEORY OF OPERATION
(Continued)
In both of the cases shown above, and especially the sec-
ond, the level of the distortion is low enough so that the
performance penalty would not be very great. And, of
course, in a spread-spectrum system the effective distor-
tion is reduced by the processing gain realized in de-
spreading the signal at the receiver. In both of these exam-
ples, however, the PN chip rate is a very modest 10% of
the frequency of the system clock; if the chip rate is in-
creased to 40% of f
RXIFCLK
, then the situation is very dif-
ferent, as shown in Figure 20.
In Figure 20, both the chip rate and the carrier frequency
have been set at 40% of the clock frequency. As a result,
the baseband mainlobe straddles the Nyquist frequency,
and the first alias of the mainlobe overlaps the spectrum of
the baseband mainlobe, thereby creating very significant
aliasing distortion which cannot be eliminated by filtering.
This level of distortion would severely affect the perfor-
mance of the system and, in general, would be completely
unacceptable.
Figure 18. Spectrum of DDS Modulated at 0.4 x f
RXIFCLK
When Carrier Frequency is set to 0.4 x f
RXIFCLK
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