AD6652PCB datasheet(30/76 Pages) AD

30 / 76 page

AD6652

Rev. 0 | Page 30 of 76

FREQUENCY TRANSLATION (FOR EXAMPLE, SINGLE 1MHz CHANNEL TUNED TO BASEBAND)

AFTER FREQUENCY TRANSLATION

NCO TUNES SIGNAL TO BASEBAND

SIGNAL OF INTEREST IMAGE

SIGNAL OF INTEREST

WIDEBAND INPUT SPECTRUM

WIDEBAND INPUT SPECTRUM (FOR EXAMPLE, 30MHz FROM HIGH SPEED ADC)

f /2

f /4

f /8

–fS/8

–fS/4

–fS/2

–3

fS/16

–3

fS/8

–5

fS/16

–fS/1

f /8

f /16

(–

fSAMPLE/2 TO + fSAMPLE/2)

fS/2

–fS/8

–fS/4

f /16

fS/4

fS/8

–fS/2

fS/8

fS/16

–3

fS/16

–3

fS/8

–5

fS/16

–fS/16

Figure 45. AD6652 Frequency Translation

fS/16

of Wideband Input Spectrum

–1.53 104

–1.03 104

1.03 104

kHz

–120

–5000

5000

53 104

–40

–60

–80

–100

–20

–1000

kHz

–800

–600

–400

–200

200

400

600

800

1000

ns. Narrower Filter (right) Designed for EDGE Application

1.6 kSPS DDC Output Rate)

–150

–140

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ificatio

te and 54

Figure 46. Filter Response (left) Meets UMTS (Wideband) Spec

(65 MSPS ADC Conversion Ra

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