GMSK Modem Data Pump
Page 8 of 37
MX909A PRELIMINARY INFORMATION
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FREQUENCY
DATA RATE
Figure 4: Typical Tx Filter Frequency Response (after the external RC Filter)
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Figure 5: Transmitted Eye Signal Diagram (after the external RC Filter)
4.1.13 Rx Level/Clock Extraction
These circuits, which operate only in receive mode, extract a bit rate clock from the received signal and
measure the received signal amplitude and DC offset. This information is then used to extract the received
bits and also to provide an input to the received Data Quality measuring circuit. The external capacitors C6
and C7 form part of the received signal level measuring circuit.
¤2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480134.005
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