2024年7月4日发(作者：)

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专利名称：Notch filter

发明人：ISHIZUKA HIROMI,石塚 博巳

申请号：JP特願昭63-282750

申请日：19881108

公开号：JP第2869980号B2

公开日：19990310

摘要：PURPOSE:To obtain a filter, where the phase is less rotated in a low band even

at the time of extending the band width of a notch, by applying the output of the notch

filter to the reference point of a two-stage T type RC filter on the input side through an

n-th order low-pass filter whose DC gain is lower than 0dB. CONSTITUTION:A voltage

follower consisting of OP amplifiers 1 and 2, a two- stage T type RC filter 4 which is

connected to the non-inverted input of this voltage follower to constitute the input

stage, and an n-th order low-pass filter which feeds back the output of the voltage

follower to the reference point of the two-stage T type RC filter 4 and has the DC gain

lower than 0dB and consists of R1, R2 and C1 are provided. An input has the voltage

divided and passes the n-th order low-pass filter and is fed back to the reference point of

the two-stage T type RC filter of the input with the same phase. Thus, plural mechanical

resonances are attenuated with one notch filter without reducing the phase margin of a

control loop having mechanical resonance, and the phase is less rotated in the low band

though the band width of the notch is extended.

申请人：NIPPON DENKI KK,日本電気株式会社

地址：東京都港区芝5丁目7番1号

国籍：JP

代理人：京本 直樹 (外2名)

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