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| 型号： | 4431-T-B1 D 434 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 37/47页 |
| 文件大小： | 799K |
| 描述： | KIT DEV TEST EZRADIOPRO SI4431 |
| 标准包装： | 1 |
| 附件类型： | 测试卡，收发器，434MHz |
| 适用于相关产品： | EZRadioPRO? |
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Si4430/31/32-B1
Rev 1.1
37
5. Internal Functional Blocks
This section provides an overview some of the key blocks of the internal radio architecture.
5.1. RX LNA
Depending on the part, the input frequency range for the LNA is between 240960 MHz. The LNA provides gain
with a noise figure low enough to suppress the noise of the following stages. The LNA has one step of gain control
which is controlled by the analog gain control (AGC) algorithm. The AGC algorithm adjusts the gain of the LNA and
PGA so the receiver can handle signal levels from sensitivity to +5 dBm with optimal performance.
In the Si4431, the TX and RX may be tied directly. See the TX/RX direct-tie reference design available on the
Silicon Labs website. for more details. When the direct tie is used, the lna_sw bit in Register 6Dh. TX Power must
be set.
5.2. RX I-Q Mixer
The output of the LNA is fed internally to the input of the receive mixer. The receive mixer is implemented as an I-Q
mixer that provides both I and Q channel outputs to the programmable gain amplifier. The mixer consists of two
double-balanced mixers whose RF inputs are driven in parallel, local oscillator (LO) inputs are driven in quadrature,
and separate I and Q I
ntermediate F
requency (IF) outputs drive the programmable gain amplifier. The receive LO
signal is supplied by an integrated VCO and PLL synthesizer operating between 240960 MHz. The necessary
quadrature LO signals are derived from the divider at the VCO output.
5.3. Programmable Gain Amplifier
The programmable gain amplifier (PGA) provides the necessary gain to boost the signal level into the dynamic
range of the ADC. The PGA must also have enough gain switching to allow for large input signals to ensure a
linear RSSI range up to 20 dBm. The PGA has steps of 3 dB which are controlled by the AGC algorithm in the
digital modem.
5.4. ADC
The amplified IQ IF signals are digitized using an Analog-to-Digital Converter (ADC), which allows for low current
consumption and high dynamic range. The bandpass response of the ADC provides exceptional rejection of out of
band blockers.
5.5. Digital Modem
Using high-performance ADCs allows channel filtering, image rejection, and demodulation to be performed in the
digital domain, resulting in reduced area while increasing flexibility. The digital modem performs the following
functions:
n Channel selection filter
n TX modulation
n RX demodulation
n AGC
n Preamble detector
n Invalid preamble detector
n Radio signal strength indicator (RSSI)
n Automatic frequency compensation (AFC)
n Packet handling including EZMAC
?/DIV>
features
n Cyclic redundancy check (CRC)
The digital channel filter and demodulator are optimized for ultra low power consumption and are highly
configurable. Supported modulation types are GFSK, FSK, and OOK. The channel filter can be configured to
support bandwidths ranging from 620 kHz down to 2.6 kHz. A large variety of data rates are supported ranging
from 0.123 up to 256 kbps. The AGC algorithm is implemented digitally using an advanced control loop optimized
for fast response time.
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PDF描述 |
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| XPEBLU-L1-0000-00201 | LED BLUE XLAMP CLR SMD |
| XPGWHT-01-0000-00FE3 | LED COOL WHITE 5000K SMD |
| 4421-DKDB2 | KIT DEV TEST EZRADIO SI4421 TRX |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 4431-T-B1D470 | 制造商:Silicon Laboratories Inc 功能描述:One tied antenna Tx/Rx test card 470MHz |
| 4431-T-B1D868 | 制造商:Silicon Laboratories Inc 功能描述:One tied antenna Tx/Rx test card 868MHz |
| 4432 | 制造商:3M Electronic Products Division 功能描述:DOUBLE COATED VINYL FOAM TAPE, BLACK, 1/4" X 72 YD 1/32" |
| 44320-01-445-1 | 制造商:UNBRANDED 功能描述:IC SOCKET +0.1UF 20WAY |
| 443204-000 | 制造商:TE Connectivity 功能描述:ST63-5-00 - Bulk |
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