參數(shù)資料
型號(hào)： HFA3863IN
廠商： INTERSIL CORP
元件分類： 無(wú)繩電話/電話
英文描述： Direct Sequence Spread Spectrum Baseband Processor
中文描述： TELECOM, CELLULAR, BASEBAND CIRCUIT, PQFP64
封裝： 10 X 10 MM, PLASTIC, MS-026ACD, TQFP-64
文件頁(yè)數(shù)： 15/39頁(yè)
文件大?。?/td> 305K
代理商： HFA3863IN
4-15
consecutive SQ1’s will cause the part to finish the
acquisition phase and enter the tracking phase.
Prior to initial acquisition the NCO is inactive (0Hz) and
carrier phase measurement are done on a symbol by symbol
basis. After acquisition, coherent DPSK demodulation is in
effect. After a brief setup time as illustrated on the timeline,
the signal begins to emerge from the demodulator.
It takes 7 more symbols to seed the descrambler before
valid data is available. This occurs in time for the SFD to be
received. At this time the demodulator is tracking and in the
coherent PSK demodulation mode so it will no longer
acquire new signals. If a much larger signal overrides the
signal being demodulated (a collision), the demodulator will
abort the tracking process and attempt to acquire the new
signal. Failure to find an SFD within the SFD timeout
interval will result in a receiver reset and return to
acquisition mode.
2
20 SYMBOLS
56 SYMBOL SYNC
SFD
TX
POWER
RAMP
20 SYMBOLS
7 SYM
16 SYMBOLS
AGC SETTLE AND LOCK
AND INITIAL DETECTION
VERIFY AND CIR/FREQUENCY
ESTIMATION AND CMF/NCO
JAMMING
SFD DET
START DATA
SEED
FIGURE 10. ACQUISITION TIMELINE, NON DIVERSITY
DESCRAMBLER
START SFD SEARCH
HFA3863
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