Realization of current‐mode biquadratic filter using CC IIs with current followers
作者:
Katsuji Ikeda,
Yasushi Tomita,
期刊:
Electronics and Communications in Japan (Part II: Electronics)
(WILEY Available online 1994)
卷期:
Volume 77,
issue 1
页码: 99-107
ISSN:8756-663X
年代: 1994
DOI:10.1002/ecjb.4420770110
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Electronic circuit;active filter;current conveyor;biquadratic filter;current‐mode
数据来源: WILEY
摘要:
AbstractThis paper proposes the circuit configuration of a current‐mode biquadratic filter which uses a pair of four‐terminal active‐current conveyors (CFCC II) consisting of a current follower attached to a second‐generation current conveyor (CC II). the circuit is composed of one current adder and two current integrators. This configuration is capable of synthesizing arbitrary current‐mode second‐order transfer functions by changing the conditions (grounding or connecting) at the output terminals of the CFCC IIs.Each of the proposed filters has high output impedance so they can be cascaded directly. Moreover, ω0andQ0is determined from the ratio of passive elements, and the element sensitivity is even lower than 0.5. Since all the passive elements are grounded, this configuration is very advantageous to IC fabrication. Again, the effect of imperfection of CFCC II on the transfer function is studied and it is found that ω0is influenced by the current conversion factor of CFCC II andQ0is affected by the imperfection of the integrator. Moreover, it is shown that the operating frequency limits of the filter are determined by the permissible change ofQ0. Each type of filter actually is synthesized, and the useful operation is confirmed b
点击下载:
PDF
(532KB)
返 回