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| 型号： | 4460-TCE10D434-EK |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 29/56页 |
| 文件大小： | 0K |
| 描述： | KIT EZRADIO TEST CARD SI4460 TX |
| 设计资源： | 4460-TCE10D434 BOM 4460-TCE10D434 PCB 4460-TCE10D434 SCH |
| 标准包装： | 1 |
| 系列： | EZRadioPRO® |
| 类型： | 收发器，ISM |
| 频率： | 434MHz |
| 适用于相关产品： | Si4460 |
| 已供物品： | 板 |
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Si4464/63/61/60
5. Internal Functional Blocks
The following sections provide an overview to the key internal blocks and features.
5.1. RX Chain
The internal low-noise amplifier (LNA) is designed to be a wide-band LNA that can be matched with three external
discrete components to cover any common range of frequencies in the sub-GHz band. The LNA has extremely low
noise to suppress the noise of the following stages and achieve optimal sensitivity; so, no external gain or front-end
modules are necessary. The LNA has gain control, which is controlled by the internal automatic gain control (AGC)
algorithm. The LNA is followed by an I-Q mixer, filter, programmable gain amplifier (PGA), and ADC. The I-Q
mixers downconvert the signal to an intermediate frequency. The PGA then boosts the gain to be within dynamic
range of the ADC. The ADC rejects out-of-band blockers and converts the signal to the digital domain where
filtering, demodulation, and processing is performed. Peak detectors are integrated at the output of the LNA and
PGA for use in the AGC algorithm.
The RX and TX pins maybe directly tied externally for output powers less than +17 dBm, see the direct-tie
reference designs on the Silicon Labs web site for more details.
5.1.1. RX Chain Architecture
It is possible to operate the RX chain in different architecture configurations: fixed-IF, zero-IF, scaled-IF, and
modulated IF. There are trade-offs between the architectures in terms of sensitivity, selectivity, and image rejection.
Fixed-IF is the default configuration and is recommended for most applications. With 35 dB native image rejection
and autonomous image calibration to achieve 55 dB, the fixed-IF solution gives the best performance for most
applications. Fixed-IF obtains the best sensitivity, but it has the effect of degraded selectivity at the image frequency.
An autonomous image rejection calibration is included in Si446x devices and described in more detail in "5.2.3.
Image Rejection and Calibration" on page 31. For fixed-IF and zero-IF, the sensitivity is degraded for data rates less
than 100 kbps or bandwidths less than 200 kHz. The reduction in sensitivity is caused by increased flicker noise as
dc is approached. The benefit of zero-IF is that there is no image frequency; so, there is no degradation in the
selectivity curve, but it has the worst sensitivity. Scaled-IF is a trade-off between fixed-IF and zero-IF. In the
scaled-IF architecture, the image frequency is placed or hidden in the adjacent channel where it only slightly
degrades the typical adjacent channel selectivity. The scaled-IF approach has better sensitivity than zero-IF but still
some degradation in selectivity due to the image. In scaled-IF mode, the image frequency is directly proportional to
the channel bandwidth selected. Figure 9 demonstrates the trade-off in sensitivity between the different architecture
options.
1% PER sensitivity vs. data rate (h=1)
-95
-100
-105
Fixed IF
-110
-115
-120
Scaled IF
Zero IF
1
10
100
Data rate (kbps )
Figure 9. RX Architecture vs. Data Rate
Rev 1.2
29
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 4460-TCE10D868-EK | 功能描述:射频开发工具 4460 10 dBm 868MHz Test Card RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| 446-0X | 制造商:Apex Tool Group 功能描述:HEX BIT PHILLIPS #0X25MM TOOL STEEL 制造商:APEX 功能描述:HEX BIT, PHILLIPS, #0X25MM, TOOL STEEL 制造商:APEX 功能描述:HEX BIT, PHILLIPS, #0X25MM, TOOL STEEL; Bit Type:Phillips; Hex Bit Size:#0; Length:25mm; Size:1" ;RoHS Compliant: NA |
| 4461 | 功能描述:电缆固定件和配件 PG16 HYBRID CG 1.48X1.10 .39-.67 RoHS:否 制造商:Heyco 类型:Cable Grips, Liquid Tight 材料:Nylon 颜色:Black 安装方法:Cable 最大光束直径:11.4 mm 抗拉强度: |
| 44-610 | 制造商:RAWLPLUG 功能描述:RAWLBOLT PROJECTING M1030P 制造商:RAWLPLUG 功能描述:RAWLBOLT, PROJECTING, M1030P |
| 44610 | 制造商:3-IN-ONE 功能描述:3IN1 SILICONE SPRAY, 400ML |
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