參數(shù)資料
型號(hào)： ISL3873AIK
廠商： INTERSIL CORP
元件分類： 微控制器/微處理器
英文描述： RES 0805 1/8W 5% 1.2KOHM
中文描述： 1 CHANNEL(S), 11M bps, LOCAL AREA NETWORK CONTROLLER, PBGA192
封裝： 14 X 14 MM, PLASTIC, BGA-192
文件頁(yè)數(shù)： 25/42頁(yè)
文件大?。?/td> 778K
代理商： ISL3873AIK
25
Meanwhile signal quality and signal frequency
measurements are made simultaneous with symbol timing
measurements. A CS1 followed by SQ1 active, or two
consecutive SQ1s 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 SFDto 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 16. ACQUISITION TIMELINE, NON DIVERSITY
DESCRAMBLER
START SFD SEARCH
PREAMBLE/HEADER
CRC-16
GENERATOR
TX_AGC_IN
V
REF
I
REF
ANTSEL
CCA
TX_DATA
SCRAMBLER
TXD
P
RXCLK
MODULATOR,
BARKER/CCK
TXI+/-
TXQ
+/-
TIMING
GENERATOR
MCLK
V
DDA
(ANALOG)
V
DD
(DIGITAL)
GND (ANALOG)
GND (DIGITAL)
TXCLK
TX_RDY
TX_PE
ANTSEL
T
P
MCLK
FIGURE 17. DSSS BASEBAND PROCESSOR, TRANSMIT SECTION
TX AGC
CONTROL
TRANSMIT
FILTER
O
T
O
DAC
DAC
TX
STATE
CONTROL
TX_IF_AGC
6-BIT
DAC
REGISTER
6-BIT
ADC
MAC
CONTROL
SIGNALS
INTERNAL
SIGNALS
I
ISL3873A
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