CMX838 데이터 시트보기 (PDF) - CML Microsystems Plc

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CMX838

FRS/PMR446/GMRS Family Radio Processor

CML Microsystems Plc 

FRS/PMR446/GMRS Family Radio Processor

CMX838

4.1.3.2 High-pass Filter

Figure 8 shows the magnitude response for the Audio High Pass Filter. This filter’s purpose is to suppress

subaudio tones when processing both Rx and Tx audio.

10

0

-10

-20

-30

-40

-50

-60

-70

-80

10

100

1000

Frequency (Hz)

Figure 8: Magnitude response of high-pass filter.

10000

4.1.3.3 Deviation Limiter Low-pass Filter

The magnitude response for narrowband and wideband modes is shown in Figure 9. Narrow-band mode is

generally required for transmitting in systems having RF Channel BW ≤12.5kHz (e.g. FRS).

5

0

WIDE BAND

-5

-10

NARROW BAND

-15

-20

-25

-30

-35

-40

1000

10000

Frequency (Hz)

Figure 9: Magnitude response of post-deviation limiter low-pass filter.

 2003 CML Microsystems Plc

13

D/838/8

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