參數(shù)資料
型號(hào)： AD9786
廠(chǎng)商： Analog Devices, Inc.
英文描述： 16-Bit, 200 MSPS/500 MSPS TxDAC+ with 2】/4】/8】 Interpolation and Signal Processing
中文描述： 16位，200 MSPS/500 MSPS的TxDAC系列2】/ 4】/ 8】插值與信號(hào)處理
文件頁(yè)數(shù)： 40/60頁(yè)
文件大?。?/td> 1497K
代理商： AD9786
AD9786
Rev. 0 | Page 40 of 60
FILTERED INTERPOLATION IMAGES
f
S
/8 MODULATION
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S
/4 MODULATION
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0
Figure 70. Complex Modulation with Negative Frequency Aliasing
Table 35. Dual Channel Complex Modulation with Hilbert
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, as shown in Figure 70. For
some applications, this can distort 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 71. Negative Frequency Image Rejection
Referring to Figure 71, by performing a second complex
modulation with a modulating signal having a fixed
π
/2 phase
difference, Figure (Y), relative to the original complex
modulation signal, Figure (X), taking the Hilbert transform of
the new resulting complex modulation, and subtracting it from
the original complex modulation 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
ALIASED NEGATIVE FREQUENCY INTERPOLATION IMAGES
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
Figure 72. Negative Frequency Aliasing Distortion
Figure 72 shows this effect at the DAC output for a mirror
asymmetric signal about dc produced by complex modulation
without a Hilbert transform. The signal bandwidth was nar-
rowed to show the aliased negative frequency interpolation
images.
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