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參數(shù)資料
| 型號(hào)： | STM32W108HBU7 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-40 |
| 文件頁(yè)數(shù)： | 123/198頁(yè) |
| 文件大?。?/td> | 2871K |
| 代理商： | STM32W108HBU7 |
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Radio frequency module
STM32W108CB, STM32W108HB
Doc ID 16252 Rev 3
5
Radio frequency module
The radio module consists of an analog front end and digital baseband as shown in
5.1
Receive (Rx) path
The Rx path uses a low-IF, super-heterodyne receiver that rejects the image frequency
using complex mixing and polyphase filtering. In the analog domain, the input RF signal
from the antenna is first amplified and mixed down to a 4 MHz IF frequency. The mixers'
output is filtered, combined, and amplified before being sampled by a 12 Msps ADC. The
digitized signal is then demodulated in the digital baseband. The filtering within the Rx path
improves the STM32W108's co-existence with other 2.4 GHz transceivers such as IEEE
802.15.4, IEEE 802.11g, and Bluetooth radios. The digital baseband also provides gain
control of the Rx path, both to enable the reception of small and large wanted signals and to
tolerate large interferers.
5.1.1
Rx baseband
The STM32W108 Rx digital baseband implements a coherent demodulator for optimal
performance. The baseband demodulates the O-QPSK signal at the chip level and
synchronizes with the IEEE 802.15.4-defined preamble. An automatic gain control (AGC)
module adjusts the analog gain continuously every symbol until the preamble is detected.
Once detected, the gain is fixed for the remainder of the packet. The baseband despreads
the demodulated data into 4-bit symbols. These symbols are buffered and passed to the
hardware-based MAC module for packet assembly and filtering.
In addition, the Rx baseband provides the calibration and control interface to the analog Rx
modules, including the LNA, Rx baseband filter, and modulation modules. The ST RF
software driver includes calibration algorithms that use this interface to reduce the effects of
silicon process and temperature variation.
5.1.2
RSSI and CCA
The STM32W108 calculates the RSSI over every 8-symbol period as well as at the end of a
received packet. The linear range of RSSI is specified to be at least 40 dB over temperature.
At room temperature, the linear range is approximately 60 dB (-90 dBm to -30 dBm input
signal).
The STM32W108 Rx baseband provides support for the IEEE 802.15.4-2003 RSSI CCA
method, Clear channel reports busy medium if RSSI exceeds its threshold.
5.2
Transmit (Tx) path
The STM32W108 Tx path produces an O-QPSK-modulated signal using the analog front
end and digital baseband. The area- and power-efficient Tx architecture uses a two-point
modulation scheme to modulate the RF signal generated by the synthesizer. The modulated
RF signal is fed to the integrated PA and then out of the STM32W108.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STM32WC-RFCKIT | 功能描述:Zigbee/802.15.4開(kāi)發(fā)工具 STM32W Low-Cost RF STM32F103 MCU Kit RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
| STM32W-RFCKIT | 功能描述:開(kāi)發(fā)板和工具包 - 無(wú)線 STM32W RF CNTRL KIT STM32F103 USB JTAG RoHS:否 制造商:Arduino 產(chǎn)品:Evaluation Boards 工具用于評(píng)估:AT32UC3L 核心:AVR32 頻率: 接口類型:USB 工作電源電壓:5 V |
| STM3-3 | 制造商:RINO MECH.(GENGARELL 功能描述: |
| STM330 | 制造商:EnOcean GmbH 功能描述:Temperature energy harvester, 868MHz |
| STM330U | 制造商:EnOcean GmbH 功能描述:Temperature energy harvester, 315MHz 制造商:EnOcean GmbH 功能描述:Temperature energy harvester, 902MHz |
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