Design of odd nth‐order elliptic high‐pass filters employing OTRAs. Issue 2 (30th January 2019)

• Record Type: Journal Article
• Authors: Chang, Chun‐Ming; Tu, Shu‐Hui; Swamy, M.N.S.; Soliman, Ahmed M.
• Is Part Of: IET circuits, devices & systems. Volume 13:Issue 2(2019)
• Page Start: 174
• Page End: 184
• Publication Date: 2019-01-30
• Subjects: frequency response -- high-pass filters -- operational amplifiers -- resistors -- elliptic filters; OTRA -- operational trans-resistance amplifiers -- analytical synthesis scheme -- infinite trans-resistance -- odd nth-order elliptic high-pass filters -- H-spice simulations -- elliptic third-order HP filters -- amplitude-frequency response; Electronic circuits -- Periodicals; Electronic systems -- Periodicals; 621.381505
• DOI: 10.1049/iet-cds.2018.5070
• Languages: English
• ISSNs: 1751-858X

Abstract

Abstract : Two new analytical synthesis methods are proposed for synthesising an n th odd‐order elliptic high‐pass (HP) filter using operational trans‐resistance amplifiers (OTRAs). The analytical synthesis scheme is based on the assumption of infinite trans‐resistance R m for the OTRA. The H‐spice simulations of the realised elliptic third‐order HP filters show that the realisation using less number of OTRAs has a performance better than that which uses more number of OTRAs, as is to be expected in view of the assumption that R m is infinite, when in fact it is finite in practice. However, it is shown that by slightly adjusting a single resistor, the amplitude–frequency response can be made close to the theoretical response.