Optimising two commonly used active-filter building blocks using the complementary transformation
作者:
G.S.Moschytz,
P.Horn,
期刊:
IEE Journal on Electronic Circuits and Systems
(IET Available online 1977)
卷期:
Volume 1,
issue 4
页码: 125-132
年代: 1977
DOI:10.1049/ij-ecs.1977.0017
出版商: IEE
数据来源: IET
摘要:
In the paper, the minimisation of the gain-sensitivity product (g.s.p.) for two important active-filter types that are finding widespread use in voiceband communication systems, in the form of hybrid-integrated filter building blocks, is considered. The first comprises a twin I for zero realisation: this is incorporated in the positive-feedback loop of a single operational amplifier and is referred to as the twin-T s.a.b.b. The known conditions for minimum g.s.p. for the twin-T s.a.b.b. are briefly recapitulated and expanded. The second comprises a differential scheme for zero realisation, and combines positive and negative feedback. It is referred to as the single-amplifier biquad (s.a.b.). The paper shows that the two circuits are closely related by the complementary transformation, and that conditions for minimum g.s.p. in both cases are identical
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