Active realization of doubly terminated LC ladder filters using current feedback operational amplifier (CFOA) via linear transformation

Said, Lobna A.; Madian, Ahmed H.; Ismail, Mahmoud H.; Soliman, Ahmed M.

doi:10.1016/j.aeue.2010.12.002

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…Specifically, (14), (15) and (18) are, respectively, the general BP and LP biquad functions, and (16) and (17) are the high-Q, below-unity-gain (<1) LP biquad functions. These biquad functions are subsequently realised in Section 4.…”

Section: Lp Ladder Filtermentioning

confidence: 99%

CMOS‐based high‐order LP and BP filters using biquad functions

Prommee

Saising

2018

IET Circuits, Devices & Systems

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This study proposes the complementary metal-oxide-semiconductor (CMOS)-based current-mode high-order active low-pass (LP) and band-pass (BP) filters using biquad functions. The passive RLC Chebyshev ladder filters were used as the prototype, and the mesh-and nodal-analysis methods to derive the biquad functions. The CMOS-based transistor-level biquad circuits were subsequently realised from the biquad functions. The high-order active LP and BP ladder filters were then synthesised from an amalgamation of the biquad circuits. Simulations were carried out to verify the performance and functionality of the LP and BP ladder filters. The results revealed that the proposed ladder filters were operable in the highfrequency range and electronically tunable, given a low-voltage supply of 1 V for the entire circuit. The proposed filters could also achieve the LP frequency response of 300 kHz-30 MHz and BP centre frequency of 200 kHz−20 MHz by means of the bias current (I B) manipulation from 1 to 100 µA. Moreover, the multi-tone simulations were undertaken to assess the filtering performance of the proposed filters and the results are agreeable with the design specifications.

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Section: Lp Ladder Filtermentioning

confidence: 99%

CMOS‐based high‐order LP and BP filters using biquad functions

Prommee

Saising

2018

IET Circuits, Devices & Systems

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“…The CFOA and CCII− blocks were used in the implementation of di®erent applications such as¯lters and oscillator circuits. [33][34][35][36]…”

Section: Di®erent Employed Active Devicesmentioning

confidence: 99%

Three Fractional-Order-Capacitors-Based Oscillators with Controllable Phase and Frequency

Said

Radwan

Madian

et al. 2017

J CIRCUIT SYST COMP

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This paper presents a generalization of six well-known quadrature third-order oscillators into the fractional-order domain. The generalization process involves replacement of three integer-order capacitors with fractional-order ones. The employment of fractional-order capacitors allows a complete tunability of oscillator frequency and phase. The presented oscillators are implemented with three active building blocks which are op-amp, current feedback operational amplifier (CFOA) and second generation current conveyor (CCII). The general state matrix, oscillation frequency and condition are deduced in terms of the fractional-order parameters. The extra degree of freedom provided by the fractional-order elements increases the design flexibility. Eight special cases including the integer case are illustrated with their numerical discussions. Three different phases are produced with fixed sum of [Formula: see text] which can be completely controlled by fractional-order elements. A general design procedure is introduced to design an oscillator with a specific phase and frequency. Two general design cases are discussed based on exploiting the degrees of freedom introduced by the fractional order to obtain the required design. Spice circuit simulations with experimental results for some special cases are presented to validate the theoretical findings.

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“…Fig. 4 shows the current-mode active filter (using multiple-output CCIIs), derived using linear transformation (LIN-T-F) in [7][8], starting from the LP ladder RLC prototype circuit in Fig. 3.…”

Section: Examplementioning

confidence: 99%

Elliptic biquadratic sections using second generation current conveyors (CCIIs)

Šesnić

Jurisic

Lutovac

2014

2014 3rd Mediterranean Conference on Embedded Computing (MECO)

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In this paper we propose a new, programmable, easytunable, current-mode general-purpose Biquad (C-GP-B), using second-generation current conveyors (CCIIs), based on the wellknown direct form II, which, among other transfer functions, is also suitable to realize band-rejection (BR) or notch transfer function. It is convenient for elliptic transfer function realizations because it can realize finite transfer function zeroes. Since it has low sensitivity and grounded capacitors it is suitable for integrated circuit (IC) design. The new Biquad is then compared in sensitivity performance with other two CCII-based versions of biquadratic sections obtained by different approaches. Since all presented Biquads use CCIIs they operate in the current mode, and are therefore suitable to realize filter circuits operating at higher frequencies, consuming less power, and needing lower supply voltage. As an example, the design procedure, and the Monte Carlo sensitivity analysis using PSpice were performed for a fourth-order elliptic low-pass (LP) filter.

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Active realization of doubly terminated LC ladder filters using current feedback operational amplifier (CFOA) via linear transformation

Cited by 24 publications

References 28 publications

CMOS‐based high‐order LP and BP filters using biquad functions

CMOS‐based high‐order LP and BP filters using biquad functions

Three Fractional-Order-Capacitors-Based Oscillators with Controllable Phase and Frequency

Elliptic biquadratic sections using second generation current conveyors (CCIIs)

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