IEC 60862-2:2012
声表面波(SAW)滤波器质量评定.第2部分:使用指南
Surface acoustic wave (SAW) filters of assessed quality - Part 2: Guide for the use
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- 标准号
- IEC 60862-2:2012
- 发布
- 2012年
- 发布单位
- 国际电工委员会
- 当前最新
- IEC 60862-2:2012
- 被代替标准
- IEC 49/933/CDV:2010 IEC 60862-2:2002
- 适用范围
- This part of IEC 60862 gives practical guidance on the use of SAW filters which are used in telecommunications@ measuring equipment@ radar systems and consumer products. IEC 60862-1 should be referred to for general information@ standard values and test conditions. SAW filters are now widely used in a variety of applications such as TV@ satellite communications@ optical fibre communications@ mobile communications and so on. While these SAW filters have various specifications@ many of them can be classified within a few fundamental categories. This part of IEC 60862 includes various kinds of filter configuration@ of which the operating frequency range is from approximately 10 MHz to 3 GHz and the relative bandwidth is about 0@02 % to 50 % of the centre frequency. It is not the aim of this standard to explain theory@ nor to attempt to cover all the eventualities which may arise in practical circumstances. This standard draws attention to some of the more fundamental questions@ which should be considered by the user before he places an order for a SAW filter for a new application. Such a procedure will be the user's insurance against unsatisfactory performance. Standard specifications@ given in IEC 60862 series@ and national specifications or detail specifications issued by manufacturers@ define the available combinations of nominal frequency@ pass bandwidth@ ripple@ shape factor@ terminating impedance@ etc. These specifications are compiled to include a wide range of SAW filters with standardized performances. It cannot be over-emphasized that the user should@ wherever possible@ select his SAW filters from these specifications@ when available@ even if it may lead to making small modifications to his circuit to enable standard filters to be used. This applies particularly to the selection of the nominal frequency.