Circuit for compensating LPF capacitor charge leak

专利名称：Circuit for compensating LPF capacitor

charge leakage in phase locked loopsystems

发明人：David William Boerstler,Eskinder Hailu申请号：US10840562申请日：20040506公开号：US06972604B2公开日：20051206

专利附图：

摘要：The present invention provides for a low pass filter. A first capacitor, has a firstassociated leakage current. A second capacitor has a specified capacitance that is a

fraction of the capacitance of the first capacitor, the second capacitor further having asecond associated leakage current. A voltage follower circuit is coupled to the output ofthe first and second capacitor. First and second current sources are coupled to thevoltage follower circuit. A bias current source is coupled the first current source. Acurrent mirror is coupled to the second current source, and the current mirror is furthercoupled to at least the anode of the first capacitor, thereby generating replacementcurrent of a capacitor within a low-pass filter.

申请人：David William Boerstler,Eskinder Hailu

地址：Round Rock TX US,Austin TX US

国籍：US,US

代理机构：Carr LLP

代理人：Diana R. Gerhardt

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