Datasheet

AD9777
Rev. C | Page 40 of 60
REAL CHANNEL (OUT)
IMAGINARY CHANNEL (OUT)
A/2
–B/2J B/2J
–A/2J A/2J
–F
C
1
F
C
F
C
–F
C
–F
C
–F
C
F
C
–F
C
A/2
B/2 B/2
COMPLEX
MODULATOR
TO QUADRATURE
MODULATOR
REAL CHANNEL (IN)
IMAGINARY CHANNEL (IN)
A
DC
B
DC
A/4 + B/4J A/4 – B/4J A/4 + B/4J A/4 – B/4J
–A/4 – B/4J
A/2 + B/2J A/2 – B/2J
A/4 – B/4J A/4 + B/4J –A/4 + B/4J
–F
Q
– F
C
–F
Q
+ F
C
–F
Q
2
–F
Q
F
Q
–F
Q
F
Q
F
Q
– F
C
F
Q
+ F
C
F
Q
QUADRATURE
MODULATOR
OUT
REAL
IMAGINARY
REJECTED IMAGES
1
F
C
= COMPLEX MODULATION FREQUENCY
2
F
Q
= QUADRATURE MODULATION FREQUENCY
02706-079
Figure 79. Two-Stage Upconversion and Resulting Image Rejection