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专利名称：Pin diode variable attenuator发明人：Omagari, Shinichi申请号：EP97101040.0申请日：19970123公开号：EP0788223A2公开日：19970806
专利附图：
摘要：It is an object of the present invention to provide a variable attenuator whichcan be produced at a low cost and can suppress production of unnecessary resonanceand propagation. When the radio frequency resistance values of PIN diodes 13 and 14 arehigher than a characteristic resistance value of a signal line interconnecting radio
frequency signal input terminal 1 and radio frequency signal output terminal 2, the sumof voltages applied to PIN diode 11 and PIN diode 13 and the sum of voltages applied toPIN diode 12 and PIN diode 14, that is, V3, are controlled so as to be fixed. But when theradio frequency resistance values of PIN diodes 13 and 14 are lower than the
characteristic resistance value of the signal line, the currents to flow through PIN diodes13 and 14 are fixed to such values with which the radio frequency resistance values andthe characteristic resistance value of the signal line are equal to each other while only thecurrents to flow through PIN diodes 11 and 12 are controlled to vary the attenuationamount.
申请人：NEC CORPORATION
地址：7-1, Shiba 5-chome Minato-ku Tokyo JP
国籍：JP
代理机构：VOSSIUS & PARTNER
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