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AD9853AS

Programmable Digital QPSK/16-QAM Modulator

Analog Devices 

AD9853

Typical Plots of Eye Diagrams and Constellations

REF LVL

–7dBm

1.2

CF 42MHz MEAS SIGNAL

SR 1.28MHz EYE [1]

DEMOD QPSK

REF LVL

–8dBm

1.2

CF 42MHz MEAS SIGNAL

SR 1.28MHz EYE [1]

DEMOD 16QAM

–1.2

0

SYMBOLS

–1.2

3

0

SYMBOLS

3

OBSOLETE Figure16. QPSKModulation

REF LVL

–7dBm

1.2

CF 42MHz MEAS SIGNAL

SR 1.28MHz CONSTELLATION

DEMOD QPSK

Figure 18. 16-QAM Modulation

REF LVL

–8dBm

1.2

CF 42MHz MEAS SIGNAL

SR 1.28MHz CONSTELLATION

DEMOD 16QAM

–1.2

–1.5

REAL

1.5

Figure 17. QPSK Modulation

–1.2

–1.5

REAL

1.5

Figure 19. 16-QAM Modulation

–10–

REV. C

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