MSK (Minimum Shift Keying) CML Microcircuits, MSK (Minimum Shift Keying) Datasheet - Page 9

• Manufacturer Part Number: MSK (Minimum Shift Keying)
• Description: Minimum Shift Keying and its Application to Wireless Data Transmission
• Manufacturer: CML Microcircuits

MSK and its Application to Wireless Data Transmission
signal frequency. This detection scheme is non-coherent because the receiver is neither phase nor time synchronized to
the transmitter.
crossing indicating signal. The zero crossing filter discriminates between good and bad occurrences of the zero crossings
and counts the bad zero crossing occurrences over a pre-defined period. The comparator compares the bad zero crossing
count with a pre-set limit to make a decision on the carrier detector output.
sampled on the rising edge of this clock to provide synchronized data output. The period of this synchronous clock is
adjusted every once per cycle if required to line up the rising edge of the clock with the middle of the unclocked data
output.
2.3 Transmit and Receive Synchronization
The modulator provides a transmit reference clock to the user, this clock needs to be used to feed the digital input data to
the device.
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
The carrier detector output indicates if MSK signal is being received. The carrier detector works off of the zero
The phase locked loop generates a reference clock running at the selected baud rate. The unclocked data output is
MSK signal I/P
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BPF
Figure 8: Non-coherent MSK demodulator.
Limiter
Mono
9
Descriminator
Zero Crossing
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Filter
Carrier detector
LPF
Comparator
Fax: [phone]
Digital PLL
S/H
&
Un-sync. data O/P
Carrier indicator
Recoverd Clock
Sync. data O/P
Doc. # 20830084.001
APPLICATION