收藏本站
SAW Components
SAW RF filter
B3903
869.0 MHz
Data sheet
ESD protection of SAW filters
SAW filters are E lectro S tatic D ischarge sensitive devices. To reduce the probability of damages
caused by ESD, special matching topologies have to be applied.
In general, “ESD matching” has to be ensured at that filter port, where electrostatic discharge is
expected.
Electrostatic discharges predominantly appear at the antenna input of RF receivers. Therefore
only the input matching of the SAW filter has to be designed to short circuit or to block the ESD
pulse.
Below three figures show recommended “ESD matching” topologies.
For wideband filters the high-pass ESD matching structure needs to be at least of 3 rd order to
ensure a proper matching for any impedance value of antenna and SAW filter input. The required
component values have to be determined from case to case.
Cs1
Cs3
Cs1
Cs3
Lp2
to output
matching
Lp2
to output
matching
Fig. 1 MLC varistor plus ESD matching
Fig. 2 Suppressor diode plus ESD matching
In cases where minor ESD occur, following simplified “ESD matching” topologies can be used
alternatively.
Cs1
Cs3
Lp2
to output
matching
Fig. 3 3 rd order high-pass structure for basic ESD protection
In all three figures the shunt inductor Lp2 could be replaced by a shorted microstrip with proper
length and width. If this configuration is possible depends on the operating frequency and
available pcb space.
Effectiveness of the applied ESD protection has to be checked according to relevant industry
standards or customer specific requirements
For further information, please refer to EPCOS Application report:
“ ESD protection for SAW filters ”.
This report can be found under www.epcos.com/rke.Click on “Applications Notes”.
Please read cautions and warnings and
important notes at the end of this document.
6
May 13, 2013
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
B39881B7845K410 FILTER SAW 881.5MHZ LOW-LOSS SMD
B39901B3934H110 FILTER SAW 902.875MHZ SMD
B39921B3588U410W9 FILTER SAW 915MHZ REMOTE SMD
B39921B3718U410 FILTER SAW 916MHZ SMD
B39921B3726U410 FILTER SAW 915MHZ REMOTE SMD
B39921B3728U410 FILTER SAW 915MHZ REMOTE SMD
B39921B4301F210 FILTER SAW 915.00MHZ SMD
B39941B3514H910 FILTER SAW 881.5/942.5MHZ SMD
相关代理商/技术参数
B39871B3962B210 功能描述:FILTER SAW SMD 制造商:qualcomm (rf360 - a qualcomm & tdk joint venture) 系列:* 零件状态:最後搶購 标准包装:9,000
B39871B5059U410 制造商:EPCOS 制造商全称:EPCOS 功能描述:SAW Tx filter CDMA 800
B39871R 808H210 制造商:TDK Epcos 功能描述:SAW RESONATOR 858,35MHZ
B39871R 858H210 制造商:TDK-EPC 功能描述:R 858 RESONATOR - Tape and Reel
B39871R0808H210 功能描述:信号调节 R 808 RESONATOR RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel
B39871R0858H210 功能描述:信号调节 FILTER RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel
B39871R1950A310 功能描述:信号调节 868.35MHz 50ohms R1950 1.2dB 12V RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel
B39871R2709U310 功能描述:信号调节 868.3 MHz 8-Pin RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel