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參數資料
| 型號： | AD9853 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Programmable Digital QPSK/16-QAM Modulator(可編程數字的四相移鍵控/16-正交幅度調制的調節器) |
| 中文描述： | 可編程數字QPSK/16-QAM調制器（可編程數字的四相移鍵控/ 16 -正交幅度調制的調節器） |
| 文件頁數： | 21/31頁 |
| 文件大小： | 339K |
| 代理商： | AD9853 |
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AD9853
–21–
REV. A
FREQUENCY SCALE – f
FREQUENCY SCALED TO SYMBOL RATE
2
0
–10
–22
–34
0.1
0.2
0.3
0.4
0.5
0.6
0.7
PASSBAND DETAIL
FREQUENCY SCALE – f
FREQUENCY SCALED TO SYMBOL RATE
0
0
–20
–40
–60
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
FIR(f)
SYSuncomp(f)
SYScomp(f)
RESPONSE OF NORMAL SRRC, NORMAL SRRC + CIC, AND COMPENSATED SRRC + CIC
FIR(f)
SYSuncomp(f)
SYScomp(f)
...EXCESS BANDWIDTH FACTOR FOR SRRC FREQUENCY RESPONSE
...PORTION OF SRRC BANDWIDTH OVER WHICH APPLY CIC CORRECTION (0<
b
<= 1)
...BANDWIDTH OF SRRC FILTER (RELATIVE TO SYMBOLRATE)
...NUMBER OF FIR PULSE SHAPING FILTER TAPS
...SETS MAX VALUE OF FIR PULSE SHAPING FILTER BASED ON FINITE WORD SIZE
...UPSAMPLING RATIO OF FIR PULSE SHAPING FILTER (RELATIVE TO THE SYMBOL RATE)
...PROCESSING GAIN OF CIC FILTERS (USED TO CORRELATE RESULTS WITH AD9853 EVAL. BD.)
...NUMBER OF COMB/INTEGRATOR STAGES IN CIC FILTER
...UNIT DELAYS PER STAGE OF CIC FILTER
...RETURNS 1 IF a<= x <= b, 0 OTHERWISE
...RETURNS NEAREST INTEGER TO x
...RATIO TO DECIBEL CONVERSION FUNCTION
...Z TRANSFORM
...SRRC FREQUENCY RESPONSE FUNCTION
(f IS RELATIVE TO THE SYMBOL RATE)
...CIC FILTER TIME INDEX FREQUENCY RESPONSE FUNCTION
–k
f
R
z
H(f,R)
R.
k = 0
N
S
GLOBAL DECLARATIONS
CONSTANTS:
a
0.5
b
0.9
PROC_GAIN
N
4
M
1
1
BW
TAPS
0.5.
a
)
41
SCALE
FreqScale
511
4
FUNCTIONS:
InRange (x,a,b)
INT(x) floor(x + 0.5)
dB(x) if (| x | = 0, –200, 20.
z(f)
(x a).(x b)
SRRC(f) passband 0.5.
a
)
stopband 0.5.
a
)
1 if InRange (f, 0, stopband)
if InRange (f, 0, passband)
cos
p
.
4
a
.
(2 .
a
– 1)if InRange (f, passband, stopband)
0 otherwise
e
2
j
p
f
. .
Figure 35. MathCad Simulation (Continued)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9853-45PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Programmable Digital OPSK/16-QAM Modulator |
| AD9853-65PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Programmable Digital OPSK/16-QAM Modulator |
| AD9853AS | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9854 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 300 MHz Quadrature Complete-DDS |
| AD9854/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For IC Digital Synthesizer Single 制造商:Analog Devices 功能描述:Direct Digital Synthesizer IC (DDS) |
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