AD6635 데이터 시트보기 (PDF) - Analog Devices

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AD6635

4-Channel, 80 MSPS WCDMA Receive Signal Processor (RSP)

Analog Devices 

AD6635

WIDEBAND INPUT SPECTRUM (؊fSAMPLE/2 TO fSAMPLE/2)

SIGNAL OF INTEREST “IMAGE”

SIGNAL OF INTEREST

–fS/2

–3fS/8 –5fS/16

–fS/4

–3fS/16

–fS/8

–fS/16

dc

fS/16

fS/8

3fS/16

fS/4

5fS/16

3fS/8

fS/2

WIDEBAND INPUT SPECTRUM (e.g., 30MHz FROM HIGH SPEED ADC)

AFTER FREQUENCY TRANSLATION

NCO “TUNES” SIGNAL TO BASEBAND

–fS/2

–3fS/8 –5fS/16

–fS/4

–3fS/16

–fS/8

–fS/16

dc

fS/16

fS/8

3fS/16

fS/4

5fS/16

3fS/8

fS/2

FREQUENCY TRANSLATION (e.g., SINGLE 1MHz CHANNEL TUNED TO BASEBAND)

Figure 1. AD6635 Frequency Translation of Wideband Input Spectrum

20

0

CIC RESPONSE

–20

COMPOSITE

RESPONSE

–40

DESIRED

RESPONSE

–60

–80

–100

–120

–1.5 ؋ 104

–1.0 ؋ 104

–5000

0

kHz

5000

1.0 ؋ 104

1.5 ؋ 104

Figure 2. Composite Filter Response of rCIC2, CIC5, and RCF for a Sample Filter Configuration

–6–

REV. 0

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