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AD9773EB データシート(PDF) 18 Page - Analog Devices

部品番号 AD9773EB
部品情報  12-Bit, 160 MSPS 2횞/4횞/8횞 Interpolating Dual TxDAC D/A Converter
PDF  19 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD9773EB データシート(HTML) 18 Page - Analog Devices

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AD9773
18
PRELIMINARY TECHNICAL DATA
Figure 15. Complex Representation of Two Stage
Upconversion
output = r eal
×
1
com plex baseband
signal
ej(ω 1+ω 2)t
dc
fr equency
1/2
1/2
−ω1-ω2
ω1+ω2
= r eal
Figure 14. Two Stage Upconversion and Resulting Image Rejection
r ea l cha nnel (in)
im a gina r y cha nnel (in)
dc
dc
a
b
rea l
im a gina r y
com plex
m odula tor
out
qua dra ture
m odula tor
r ea l cha nnel (out)
im a gina r y cha nnel (out)
a/2
a/2
fC
-fC*
-
+
fC
-fC
b/2j
- b/2j
b/2
b/2
fC
-fC
fC
-fC
a/2j
- a /2j
to qua dr a tur e
m odula tor
a /4+b/4j
a /4- b/4j
a /4- b/4j
-fQ*
-fQ
fQ
fQ
-f
Q
+f
C
-f
Q
-f
C
f
Q
+f
C
f
Q
-f
C
-
a /4- b/4j a /4+b/4j
- a /4+b/4j
=
-fQ
fQ
a /2- b/2j
r ejected im a ges
*fC = com plex m odulation frequency
a /4+b/4j
- a /4- b/4j
*fQ = quadrature m odulation frequency
a /2+b/2j
In purely complex terms, figure 15 represents the two
stage upconversion from complex baseband to carrier.
In this example,
ω1 and ω2 represent the modulation
frequencies of the digital complex modulator and the
quadrature modulator.
REV. PrA



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