參數(shù)資料
型號(hào): AD9786-EBZ
廠商: Analog Devices Inc
文件頁數(shù): 36/56頁
文件大?。?/td> 0K
描述: BOARD EVALUATION FOR AD9786
產(chǎn)品培訓(xùn)模塊: DAC Architectures
標(biāo)準(zhǔn)包裝: 1
系列: TxDAC+®
DAC 的數(shù)量: 1
位數(shù): 16
采樣率(每秒): 500M
數(shù)據(jù)接口: 并聯(lián)
DAC 型: 電流
工作溫度: -40°C ~ 85°C
已供物品: 板,CD
已用 IC / 零件: AD9786
AD9786
Rev. B | Page 41 of 56
03152-076
1200
100
200
400
600
800
1000
–4
4
3
–1
1
2
–2
–3
0
Figure 76. Phase Response of Hilbert Transform
Table 37. Dual Channel Complex Modulation Sideband Selection
Sideband
Mode
0
Upper IF sideband rejected
1
Lower IF sideband rejected
0
90
AD9786
LO
I
Q
Im()
Re()
03152-077
Figure 77. AD9786 Driving Quadrature Modulator
The AD9786 can be configured to drive a quadrature modulator,
as in Figure 77. When two AD9786s are used with one AD9786
producing the real output, the second AD9786 produces the
imaginary output. By configuring the AD9786 as a complex
modulator coupled to a quadrature modulator, IF image
rejection is possible. The quadrature modulator acts as the real
part of a complex modulation, producing a double sideband
spectrum at the local oscillator (LO) frequency with mirror
symmetry about dc.
A baseband double sideband signal modulated to IF increases
IF filter complexity and reduces power efficiency. If the base-
band signal is complex, a single sideband IF modulation can be
used, relaxing IF filter complexity and increasing power
efficiency.
The AD9786 has the ability to place the baseband single side-
band complex signal either above or below the IF frequency.
Figure 78, Figure 79, and Figure 80 illustrate this.
03152-078
0.5
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
dBFS
–150
0
–50
–100
Figure 78. Upper IF Sideband Rejected
03152-079
0.5
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
dBFS
–150
0
–50
–100
Figure 79. Lower IF Sideband Rejected
0
f IF
–f
IF
f IF
0
f IF
BASEBAND
IF
SIDEBAND = 1
SIDEBAND = 0
03152-080
Figure 80. IF Quadrature Modulation of Real and Complex Baseband Signals
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