HFA3726IN 데이터 시트보기 (PDF) - Intersil

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HFA3726IN

400MHz Quadrature IF Modulator/Demodulator

Intersil 

HFA3726

Typical Performance Curves, Modulator (Figure 23 Test Diagram) (Continued)

1dB/DIV.

+10%

0dB

-3dB

1MHz

2MHz

10MHz

FIGURE 18. TYPICAL MODULATOR I/Q 3dB CUTOFF

FREQUENCY CURVE

2%/DIV.

+10%

-10%

-15

-10

-5

0

+5

+10 +15

((900-RTUNE)/RTUNE) * 100%

FIGURE 19.

LPF

TA =

CUTOFF

25oC

FREQUENCY

vs

RTUNE,

VCC

=

3V,

-24dBm

0%

-10%

-60 -40 -20 0 20 40 60 80 100

TEMPERATURE

FIGURE 20. LPF CUTOFF FREQUENCY vs TEMPERATURE

AND VCC (NOTE 14 ON AC ELECTRICAL SPECS,

MODULATOR PERFORMANCE TABLE)

SPAN 50MHz

BW = 100kHz

VBW = 30kHz

VIDEO AVERAGE

280MHz

FIGURE 21. TYPICAL MODULATOR SPREAD SPECTRUM

OUTPUT 11M CHIPS/s, QPSK. RTUNE = 900Ω

12

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