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參數(shù)資料
| 型號： | AD9753ASTZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 12-BIT DAC, PQFP48 |
| 封裝： | 1.40 MM HEIGHT, ROHS COMPLIANT, PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 814K |
| 代理商： | AD9753ASTZRL |
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REV. B
–20–
AD9753
–20
CENTER 860MHz
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
11MHz/
SPAN 110MHz
REF
LV1
(dBm)
2MA
MARKER 1 [T2]
RBW
10kHz
RF ATT
0dB
–99.88dBm
VBW
10kHz
859.91983968MHz
SWT
2.8 s
UNIT
dBm
COMMENT A: 25 MSYMBOL, 64 QAM CARRIER @ 825MHz
–99.88bBm,
+859.91983968MHz
–65.67dBm
–65.15dBm
–7.05dBm
33.10dB
–49.91983968MHz
33.10dB
–49.91983968MHz
1 [T2]
CH PWR
ACP UP
ACP LOW
1 [T2]
2 [T2]
C11
C0
Cu1
1
2
Figure 31. Signal of Figure 28 Mixed to Carrier
Frequency of 800 MHz
Effects of Noise and Distortion on Bit Error Rate (BER)
Textbook analyses of Bit Error Rate (BER) performance are
generally stated in terms of E (energy in watts-per-symbol or
watts-per-bit) and NO (spectral noise density in watts/Hz).
For QAM signals, this performance is shown graphically in
Figure 32. M represents the number of levels in each quadra-
ture PAM signal (i.e., M = 8 for 64 QAM, M = 16 for 256 QAM).
Figure 32 implies gray coding in the QAM constellation, as well
as the use of matched filters at the receiver, which is typical.
The horizontal axis of Figure 32 can be converted to units of
energy/symbol by adding to the horizontal axis 10 log of the
number of bits in the desired curve. For instance, to achieve a
BER of 1e-6 with 64 QAM, an energy per bit of 20 dB is neces-
sary. To calculate energy per symbol, we add 10 log(6), or
7.8 dB. 64 QAM with a BER of 1e-6 (assuming no source or
channel coding) can therefore theoretically be achieved with
an energy/symbol-to-noise (E/NO) ratio of 27.8 dB. Due to the
loss and interferers inherent in the wireless path, this signal-to-
noise ratio must be realized at the receiver to achieve the given
bit error rate.
Distortion effects on BER are much more difficult to determine
accurately. Most often in simulation, the energies of the strongest
distortion components are root-sum-squared with the noise, and
the result is treated as if it were all noise. That being said, if the
example above of 64 QAM with the BER of 1e-6, using the
E/NO ratio is much greater than the worst-case SFDR, the noise
will dominate the BER calculation.
The AD9753 has a worst-case in-band SFDR of 47 dB at the
upper end of its frequency spectrum (see TPCs 4 and 7). When
used to synthesize high level QAM signals as described above,
noise, as opposed to distortion, will dominate its performance in
these applications.
SNR/BIT (dB)
1E–0
1E–3
1E–6
20
5
0
SYMBOL
ERR
OR
PR
OB
ABILITY
1E–2
1E–5
1E–1
1E–4
10
15
16 QAM
64 QAM
4 QAM
20
Figure 32. Probability of a Symbol Error for QAM
Pseudo Zero Stuffing/IF Mode
The excellent dynamic range of the AD9753 allows its use in
applications where synthesis of multiple carriers is desired. In
addition, the AD9753 can be used in a pseudo zero stuffing
mode that improves dynamic range at IF frequencies. In this
mode, data from the two input channels is interleaved to the
DAC, which is running at twice the speed of either of the input
ports. However, the data at Port 2 is held constant at midscale.
The effect of this is shown in Figure 33. The IF signal is the
image, with respect to the input data rate, of the fundamen-
tal. Normally, the sinx/x response of the DAC will attenuate
this image. Zero stuffing improves the pass-band flatness so that
the image amplitude is closer to that of the fundamental sig-
nal. Zero stuffing can be an especially useful technique in the
synthesis of IF signals.
FREQUENCY (Normalized to Input Data Rate)
0
–30
2
0.5
0
EFFECT
OF
SINX/X
R
O
LL-OFF
–20
–50
–10
–40
1
1.5
AMPLITUDE
OF IMAGE
WITHOUT
ZERO STUFFING
AMPLITUDE
OF IMAGE
USING
ZERO STUFFING
Figure 33. Effects of Pseudo Zero Stuffing on
Spectrum of AD9753
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