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参数资料
| 型号： | AD8349AREZ-RL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| 封装： | MO-153ABT, TSSOP-16 |
| 文件页数： | 13/28页 |
| 文件大小： | 729K |
| 代理商： | AD8349AREZ-RL7 |
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AD8349
Rev. A | Page 20 of 28
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
AMP
L
ITUDE
(dBm)
CENTER 2.14GHz
SPAN 10MHz
03570-0-077
SSB = 1.7dBm
LO = –71.4dBm
USB = –52dBc
THIRD HARMONIC = –36.8dBc
Figure 55. AD8349 Single Sideband Spectrum at 2140 MHz after LO Nulling
SIDEBAND SUPPRESSION AND LO FEEDTHROUGH
VS. TEMPERATURE
In practical applications, reduction of LO feedthrough and
undesired sideband suppression can be performed as a one time
calibration, with the required correction factors being stored in
nonvolatile RAM. These compensation schemes hold up well
LO feedthrough and sideband suppression over temperature
after compensation is performed at 25°C.
SINGLE SIDEBAND PERFORMANCE VS. BASEBAND
DRIVE LEVEL
Figure 56 shows the SSB output power and noise floor in
dBc/100 kHz versus baseband drive level at LO frequencies of
940 MHz, 1960 MHz, and 2140 MHz.
IMPROVING THIRD HARMONIC DISTORTION
While sideband suppression can be improved by adjusting the
relative baseband amplitudes and phase, the only means
available to reduce the third harmonic is to reduce the output
power. (See Figure 19, Figure 20, and Figure 21). It is worth
noting, however, that as the output power is reduced, the noise
floor, in dBc, stays fairly constant at the higher end of the power
curve (Figure 56). This indicates that the output power can be
reduced to a level that yields an acceptable third harmonic
without incurring a signal-to-noise ratio penalty. The constant
SNR vs. output power relationship also indicates that baseband
voltage variations can be effectively used to control system
output power and/or regulate signal chain gain.
–14
–10
–6
–8
–12
–2
–4
4
2
6
0
–104
–90
–86
–88
–84
–102
–100
–98
–96
–94
–92
0.2
0.3
0.4
0.5
0.8
0.6
0.9
1.0
1.2
1.1
0.7
03570-0-056
DIFFERENTIAL BASEBAND DRIVE (V p-p)
S
B
OUTP
UT
P
O
WE
R
(dBm)
20
M
H
z
N
O
ISE
FLOOR
(
d
B
C
/100kH
z)
940 SSB
1960 SSB
2140 SSB
1960 20 MHz NOISE
940 20 MHz NOISE
2140 20 MHz NOISE
Figure 56. SSB POUT and 20 MHz Noise Floor vs. Baseband Drive Level
(FLO = 940 MHz, 1960 MHz, and 2140 MHz)
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PDF描述 |
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| AD8350ARZ20 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| AD8350ARZ15-REEL7 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| AD8350ARMZ15-REEL7 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8349EVAL | 制造商:Analog Devices 功能描述:IC ((NS)) |
| AD8349-EVAL | 制造商:Analog Devices 功能描述:AD8349 EVALUATION BOARD - Bulk |
| AD8349-EVALZ | 制造商:Analog Devices 功能描述:AD8349 EVALUATION BOARD - Bulk |
| AD8349XRE | 制造商:Analog Devices 功能描述:800 MHZ - 2.7 GHZ QUADRATURE MODULATOR - Rail/Tube |
| AD8349XRE-REEL7 | 制造商:Analog Devices 功能描述:800MHZ-2.7GHZ QUADRATURE MODULATOR - Tape and Reel |
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