參數(shù)資料
型號(hào)： AD8349ARE-REEL7
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 衰減器
英文描述： 700 MHz to 2700 MHz Quadrature Modulator
中文描述： 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR
封裝： MO-153ABT, TSSOP-16
文件頁(yè)數(shù)： 20/28頁(yè)
文件大?。?/td> 969K
代理商： AD8349ARE-REEL7
AD8349
SINGLE SIDEBAND PERFORMANCE VERSUS
BASEBAND DRIVE LEVEL
Rev. 0 | Page 20 of 28
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 versus 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
0
DIFFERENTIAL BASEBAND DRIVE (V p-p)
S
2
940 SSB
1960 SSB
2140 SSB
1960 20 MHz NOISE
940 20 MHz NOISE
2140 20 MHz NOISE
Figure 56. SSB P
OUT
and 20 MHz Noise Floor vs. Baseband Drive Level
(F
LO
= 940 MHz, 1960 MHz, and 2140 MHz)
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