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(yè)數(shù): 51/54頁(yè)
文件大小: 449K
代理商: Z87200
Z87200
Zilog
Spread-Spectrum Transceiver
DS96WRL0400
4-51
4
The example of Figure 18 demonstrates that aliasing dis-
tortion of the BPSK/QPSK modulator output will result if
significant energy of the baseband component’s spectrum
falls beyond the Nyquist frequency of f
RXIFCLK/2
. The first
alias will then shift that energy into the region below the
Nyquist frequency and potentially interfere with the desired
signal. In Figure 19 the second and third sidelobes of the
first alias fall within the mainlobe of the baseband compo-
nent, where the magnitude of this corrupting signal is ap-
proximately –13 dBc.
In Figure 20, by contrast, the level of distortion is consider-
ably reduced by programming an I.F. frequency that in-
creases the separation of the baseband mainlobe from the
alias mainlobe. Here, the carrier frequency has been re-
duced to 0.25 x f
RXIFCLK
, and now the fourth and fifth side-
lobes of the first alias lie in the same part of the spectrum
as the baseband mainlobe, reducing the distorting energy
to approximately –23 dBc at the peak of the fourth side-
lobe.
Figure 17. Spectrum of DDS modulated at 0.1 x f
RXIFCLK
when carrier frequency is set to 0.25 x f
RXIFCLK
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