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| 型號： | AD9782 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 200 MSPS/500 MSPS TxDAC+ with 2 x /4 x /8 x Interpolation and Signal Processing |
| 中文描述： | 12位，200 MSPS/500 MSPS的TxDAC系列與2 × / 4 × / 8 ×插值與信號處理 |
| 文件頁數(shù)： | 35/52頁 |
| 文件大?。?/td> | 1619K |
| 代理商： | AD9782 |
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Preliminary Technical Data
AD9782
Rev. PrC | Page 35 of 52
FILTERED INTERPOLATION IMAGES
f
S
/8 MODULATION
f
S
/4 MODULATION
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Figure 58. Complex Modulation with Negative Frequency Aliasing
DUAL CHANNEL COMPLEX MODULATION WITH
HILBERT
Table 34.
HILBERT
Mode
0
Hilbert transform off
1
Hilbert transform on
When complex modulation is performed, the entire spectrum is
translated by the modulation factor. If the resulting modulated
spectrum is not mirror symmetric about dc, when the DAC
synthesizes the modulated signal, negative frequency compo-
nents will fall on the positive frequency axis and can cause
destructive summation of the signals. For some applications,
this can be seen as distorting the modulated output signal.
Re
Im
f
Re
Im
f
Re
Im
f
Re
Im
f
00
00
A/2
A/2
A/2
A/2
A
A
A/2
A/2
A/2
A/2
A/2
A/2
A/2
A/2
X = Ae
j2
π
(f + fm)t
Y = Ae
j2
π
(f + fm)t –
π
/2
Z = HILBERT(Y)
C = X – Z
0
Figure 59. Negative Frequency Image Rejection
By performing a second complex modulation with a modu-
lating signal having a fixed
π
/2 phase difference, Figure 59 (Y),
relative to the original complex modulation signal, Figure 59
(X), taking the Hilbert transform of the new resulting complex
modulation, and subtracting it from the original complex mod-
ulation output all negative frequency components can be folded
in phase to the positive frequency axis before being synthesized
by the DAC. When the DAC synthesizes the modulated output
there are no negative frequency components to fold onto the
positive frequency axis out of phase; consequently no distortion
is produced as a result of the modulation process.
0
0.5
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
d
–150
0
–50
–100
ALIASED NEGATIVE FREQUENCY INTERPOLATION IMAGES
Figure 60. Negative Frequency Aliasing Distortion
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