- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371807 > HFA3824AIV (INTERSIL CORP) Direct Sequence Spread Spectrum Baseband Processor PDF資料下載
參數(shù)資料
| 型號(hào)： | HFA3824AIV |
| 廠商： | INTERSIL CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Direct Sequence Spread Spectrum Baseband Processor |
| 中文描述： | TELECOM, CELLULAR, BASEBAND CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 23/40頁 |
| 文件大?。?/td> | 271K |
| 代理商： | HFA3824AIV |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁當(dāng)前第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
2-121
Clock Offset Tracking Performance
The PRISM baseband processor is designed to accept data
clock offsets of up to
±
25ppm for each end of the link (TX
and RX). This effects both the acquisition and the tracking
performance of the demodulator. The budget for clock offset
error is 0.75dB at
±
50ppm as shown in Figure 18.
Carrier Offset Frequency Performance
The correlators in the baseband processor are time invariant
matched filter correlators otherwise known as parallel correla-
tors. They use two samples per chip and are tapped at every
other shift register stage. Their performance with carrier fre-
quency offsets is determined by the phase roll rate due to the
offset. For an offset of +50ppm (combined for both TX and RX)
will cause the carrier to phase roll 22.5 degrees over the length
of the correlator. This causes a loss of 0.22dB in correlation
magnitude which translates directly to Eb/N0 performance loss.
In the PRISM chip design, the correlator is not included in the
carrier phase locked loop correction, so this loss occurs for both
acquisition and data. Figure 19 shows the loss versus carrier
offset taken out to +350kHz (120kHz is 50ppm at 2.4GHz).
Offset data taken with QPSK data.
I/Q Amplitude Imbalance
Imbalances in the signal cause differing effects depending
on where they occur. In a system using a limiter, if the imbal-
ances are in the transmitter, that is, before the limiter, ampli-
tude imbalances translate into phase imbalances between
the I and Q symbols. If they occur in the receiver after the
limiter, they are not converted to phase imbalances in the
symbols, but into vector phase imbalances on the composite
signal plus noise. The following curve shows data taken with
amplitude imbalances in the transmitter. Starting at the bal-
anced condition, I = 100% of Q, the bit error rate degrades
by two orders of magnitude for a 3dB drop in I (70%).
A Default Register Configuration
The registers in the HFA3824A are addressed with 14-bit
numbers where the lower 2 bits of a 16-bit hexadecimal
address are left as unused. This results in the addresses
being in increments of 4 as shown in the table below. Table 10
shows the register values for a default Full Protocol configura-
tion (Mode 3) with a single antenna. The data is transmitted
as DQPSK. This is a recommended configuration for initial
test and verification of the device and /or the radio design. The
user can later modify the CR contents to reflect the system
and the required performance of each specific application.
1E-09
1E-08
1E-07
1E-06
1E-05
1E-04
1E-03
1E-02
1E-01
1
1
1
1
1
1
9
8
Eb/N0 IN dB
B
THEORY (DBPSK)
DBPSK
DQPSK
FIGURE 17. BER vs EB/N0 PERFORMANCE
1E-5
1E-4
1E-3
-100
-60
-20
20
60
100
OFFSET IN ppm
B
FIGURE 18. BER vs CLOCK OFFSET
1E-6
1E-5
1E-4
1E-3
-
-
-
-
5
1
2
3
FREQUENCY OFFSET (kHz)
B
FIGURE 19. BER vs CARRIER OFFSET
1E-05
1E-04
1E-03
1E-02
1E-01
1
9
8
8
7
7
PERCENT AMPLITUDE BALANCE
8
B
9
6
FIGURE 20. I/Q IMBALANCE EFFECTS
HFA3824A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HFA3824A | Direct Sequence Spread Spectrum Baseband Processor |
| HFA3842B | PCMCIA/USB Wireless LAN Medium Access Controller |
| HFA3842BIN | PCMCIA/USB Wireless LAN Medium Access Controller |
| HFA3842BIN-TK | PCMCIA/USB Wireless LAN Medium Access Controller |
| HFA3842IN96 | Wireless LAN Medium Access Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFA3824AIV WAF | 制造商:Harris Corporation 功能描述: |
| HFA3824AIV96 | 制造商:Rochester Electronics LLC 功能描述:BASEBAND PROCESSOR - Bulk |
| HFA3824EVAL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HFA3824IV | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HFA3824IV96 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。