Rainbow-electronics MAX2108 Manual de usuario descargar pdf (Pagina 9)

MAX2108

Direct-Conversion Tuner IC

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MHz

DESIRED

CHANNEL

(20Msps)

dBc

AT POINT

010

PASSBAND FILTER REQUIREMENTS:

(1) <20% OF BAUD PERIOD DELAY RIPPLE

(2) <0.1dB GAIN RIPPLE

TRANSITION BAND FILTER REQUIREMENTS:

< 2dB GAIN RIPPLE

FILTER CUTOFF

12 20 28 40 MHz17.16

-30

ADC SAMPLING

TRANSPONDER SPACING = 29.16 MHz

LOWPASS FILTER RESPONSE

DESIRED

CHANNEL

(20Msps)

UNDESIRED ADJACENT CHANNEL

TRANSPONDER BW = 24MHz

dBc

AT POINT

010

DATA NYQUIST

NYQUIST FOR ADC

α = 0.2

12 20 29.16 40 41.1617.16

-30

ADC SAMPLING

MHz

DESIRED

CHANNEL

(20Msps)

ADJ

CHANNEL

FOLDOVER

dBc

AT POINT

010

ADC NYQUIST

12 20 4017.16

-30

ADC SAMPLING

MHz

DESIRED

CHANNEL

(20Msps)

FOR POINTS 1, 2, 3, 4, REFER TO FIGURE 1

DIGITAL MATCHED FILTER

dBc

AT POINT

0 10 12 40

-30

ADC SAMPLING

Figure 2. Lowpass Filtering Example

1 2 3 4 5 6 7 8 9 10 11 12

Direct-Conversion Tuner IC 1

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Rainbow-electronics MAX2108 Manual de usuario Pagina 9

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