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公开(公告)号:EP1737127A1
公开(公告)日:2006-12-27
申请号:EP06012881.6
申请日:2006-06-22
发明人: Minsu, Jeong , Seyeob, Kim
IPC分类号: H03H11/12
CPC分类号: H03H11/1291 , H03H7/0153 , H03H2210/021 , H03H2210/043
摘要: The present invention relates to a filter and, more particularly, to a tuning circuit of a filter for correcting a cut-off frequency of the filter. The tuning circuit comprises a current generation unit (210) having a first transistor (MN21) and a variable resistor unit (213), and a capacitance correction unit (220) having a second transistor (MN22), a capacitor unit (223), an up-down counter (222) and a selection unit (S4) for selecting a control path of the up-down counter for varying the resistance or capacitance.
摘要翻译: 滤波器的调谐电路本发明涉及一种滤波器,更具体地说,涉及一种用于校正滤波器的截止频率的滤波器的调谐电路。 该调谐电路包括具有第一晶体管(MN21)和可变电阻器单元(213)的电流产生单元(210),以及具有第二晶体管(MN22),电容器单元(223),电容器单元 一个可逆计数器(222)和一个选择单元(S4),用于选择升降计数器的控制路径以改变电阻或电容。