參數(shù)資料
型號(hào)： RF2958
廠商： RF MICRO DEVICES INC
元件分類： 無(wú)繩電話/電話
英文描述： 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
中文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC32
封裝： 5 X 5 MM, QFN-32
文件頁(yè)數(shù)： 9/20頁(yè)
文件大小： 235K
代理商： RF2958
11-271
RF2958
Rev A0 050209
Theory of Operation
The RF2958 is a single-chip transceiver designed specifically for IEEE 802.11b wireless LAN applications. In addition to
typical transceiver functions of RF conversion of both the transmit and receive signals, the RF2958 incorporates a low-
noise amplifier (LNA) and a dual phase-locked loop (PLL) frequency synthesizer to reduce end-product component
count and to simplify integration into end-products. The RF2958 uses a superheterodyne frequency conversion architec-
ture in both the transmit and receive signal paths for superior performance in 802.11b applications. It also incorporates
power conservation functionality to increase battery life in portable and mobile applications. When used with the RF3002
baseband processor and RF5189 power amplifier (PA), the RF2958 is part of a complete PHY solution for 802.11b appli-
cations (see figure below, 2.4GHz IEEE 802.11b Chipset Block Diagram).
SYSTEM ARCHITECTURE
The overall system architecture is based around a superheterodyne conversion process. For the transmitter side, the
baseband in-phase (I) and quadrature (Q) signal components are converted to an intermediate frequency (IF) of
374MHz. An external SAW filter is used to filter out undesired spurious frequencies. The IF is then converted to the over-
the-air radio frequency (RF) between 2.412GHz and 2.483GHz using low-side injection. The RF output drives a PA to
amplify the signal to the desired power level at the antenna. Generally the PA is followed by a TX/RX switch and a band
pass filter which eliminates the undesired sideband resulting from the mixing process before broadcasting the signal
through the antenna.
The receiver is the inverse of this process. The signal from the antenna passes through the band pass filter, which is in
this case acting as a pre-selection filter. The received signal passes through the integrated LNA and is converted to an IF
of 374MHz. The signal then passes through a SAW filter, which acts to reject adjacent channels as defined by the
802.11 standard. Due to the bandwidth of this filter, adjacent channels must be at least 20MHz apart. The filtered IF sig-
nal is then downconverted to baseband I and Q components.
The local oscillators required by the mixing process are generated by internal IF and RF PLL frequency synthesizers.
These are controlled through a three-wire serial data interface.
RF2958
SDI
f
= 374 MHz
BW = 20 MHz
IF PLL
RF PLL
Serial Data
Interface
PLL/Power
Control Registers
REF
TX VGC
RX VGC
RF3002
CCA
RX VGC
802.11
Preamble/
Header
802.11
Preamble/
Header
Control
Port
RXVGC
DAC
Q IN
ADC
TX VGC
DAC
I OUT
DAC
Q OUT
DAC
M
Mode Control
Tx Length
Tx Signal
Service
D
I IN
ADC
Data Converter
Reference
ANT SEL
RX I
VREF
RX Q
TX I
TX Q
M CLK
TX PE
RX PE
TX DATA
TX RDY
SPI
RX RDY
RX DATA
CCA
LNA GS
DATA CLK
TX/RX
SWITCH
f
= 2450 MHz
BW = 100 MHz
ANTENNA
DIVERSITY
SWITCH
TX PE
RX PE
RF5189
相關(guān)PDF資料
PDF描述
RF2958PCBA 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
RF2958TR13 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
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RF3160PCBA DUAL-BAND GSM/DCS POWER AMP MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RF2958PCBA 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHz SPREAD-SPECTRUM TRANSCEIVER
RF2958TR13 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHz SPREAD-SPECTRUM TRANSCEIVER
RF2959-000 制造商:TE Connectivity 功能描述:GAS TUBE 5MM 600V 20% 5KA SMD
RF2960-000 制造商:TE Connectivity 功能描述:GAS TUBE 8MM 800V 15% 5KA AXIAL
RF2961-000 制造商:TE Connectivity 功能描述:GAS TUBE 5MM 420V 20% 2.5KA SMD
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