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參數(shù)資料
| 型號： | 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)： | 46/54頁 |
| 文件大小： | 449K |
| 代理商： | Z87200 |
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Z87200
Spread-Spectrum Transceiver
Zilog
4-46
DS96WRL0400
THEORY OF OPERATION
(Continued)
The optimum choice of I.F. frequency discussed above
can be extended beyond the primary Nyquist region. Since
an I.F frequency of n f
SA
+ f1 produces exactly the same
result for any value of n, the general condition for optimum
separation of the desired signal and the unwanted alias is:
f1 = n f
SA
+ 1 /4 f
SA
and B< 1 /2 f
SA
for positive integer n and positive B and f
1
.
And, if care is taken to handle the effect of high side con-
version, the following I.F. frequencies also fulfill the opti-
mum condition:
f1= n f
SA
1/4 f
SA
and B< 1/2 f
SA
for positive integer n and positive B and f
1
.
Using the Z87200 with Two ADCs in Quadra-
ture Sampling Mode
Quadrature Sampling Mode requires that quadrature I and
Q channel I.F. inputs are sampled by two ADCs and input
to the Z87200’s Downconverter. All four multipliers of the
Downconverter’s complex multiplier are then used to per-
form true single sideband downconversion to baseband.
Quadrature inputs imply that the input signal is complex,
and the input signal spectrum shown in line 1 of Figure 15
is thus only single-sided with no mirror image spectral
component. As a result, the image alias within the primary
Nyquist region associated with Direct I.F. Sampling Mode
does not appear and does not have to be attenuated by the
Integrate and Dump filter. As in the prior discussion, this
analysis holds as long as B < 1/2 f
SA
, 1/2 B < f1, and the
input spectrum is only defined for frequencies within a sin-
gle Nyquist region; that is, non-zero over frequencies f
such that:
(n–1/2)f
SA
<|f|<(n+1/2)f
SA
for positive integer n.
Figure 15. Spectra of Signals in Quadrature Sampling Mode
FREQ.
INPUT SPECTRUM
BANDWIDTH: B
0
FREQ.
0
FREQ.
SPECTRUM
AFTER A/D
0
FREQ.
SPECTRUM AFTER IDEAL DIGITAL LOW PASS FILTER
0
FREQ.
QUADRATURE
NCO SPECTRUM
0
–f
1
FREQ.
SPECTRUM AFTER MIXER
0
SPECTRUM OF
SAMPLING PROCESS
2 f
1
f
SA
–2 f
1
f
SA
1
2
3
4
5
6
–f
SA
f
SA
–f
SA
f
SA
–f
SA
f
SA
–f
SA
f
SA
–f
SA
–f
1
f
1
–f
1
f
1
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