Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers

Kumngern, Montree; Khateb, Fabian

doi:10.1007/s10470-018-1345-8

Cited by 15 publications

(16 citation statements)

References 56 publications

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“…In this manner, Equation (2) can be updated to (11), and then the symbolic transfer function can be expressed by Equation 12, from which one can evaluate the angular frequency ω o and Q, as given by Equations (13) and (14).…”

Section: Simulation and Signal Flow Graph Analysismentioning

confidence: 99%

“…Fortunately, if one designs an opamp-RC filter with stable and high Q factor, such a topology can be transformed to a Gm-C one that can work in voltage-mode or current-mode, as shown in the work by the authors of [10]. For instance, some recent efforts on designing BPF responses work in current-mode, like in works by the authors of [11,12]; in voltage-mode, like in works by the authors of [13,14]; or apply modern active devices, like in works by the authors of [15][16][17]. Also, other efforts are oriented to provide reconfigurability and tune-ability at the same time and designing fractional-order circuits as in the work by the authors of [18].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Q-Factor in a Biquadratic Bandpass Filter Implemented with Opamps

et al. 2019

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Active filter design is a mature topic that provides good solutions that can be implemented using discrete devices or integrated circuit technology. For instance, when the filter topologies are implemented using commercially available operational amplifiers (opamps), one can explore varying circuit parameters to tune the central frequency or enhance the quality (Q) factor. We show the addition of a feedback loop in the signal flow graph of a biquadratic filter topology, which enhances Q and highlights that a sensitivity analysis can be performed to identify which circuit elements influence central frequency, Q, or both. In this manner, we show the opamp-based implementation of a biquadratic bandpass filter, in which Q is enhanced through performing a sensitivity analysis for each circuit element. Equations for the central frequency and Q are provided to observe that there is not a direct parameter that enhances them, but we show that from sensitivity analysis one can identify the circuit elements that better enhance Q-factor.

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Section: Simulation and Signal Flow Graph Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Q-Factor in a Biquadratic Bandpass Filter Implemented with Opamps

et al. 2019

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“…Recently, the structures that can give both universal filter and quadrature oscillator have been reported [40]- [57]. The universal filter and quadrature oscillator can be obtained with the same topology [40]- [49] however, it is necessary to change the connection for obtaining either a universal filter or a quadrature oscillator.…”

Section: Introductionmentioning

confidence: 99%

“…The structure in [51] realizes quadrature oscillator and its structure can be modified to work as universal filter, but only LP and BP filtering responses are obtained. The structures in [52]- [57] realize universal filter and quadrature oscillator without changing any connection. In [52]- [53], either a universal filter or a quadrature oscillator can be obtained by selecting the switches, but passivematching condition is required for obtaining HP filtering response.…”

Section: Introductionmentioning

confidence: 99%

“…In [52]- [53], either a universal filter or a quadrature oscillator can be obtained by selecting the switches, but passivematching condition is required for obtaining HP filtering response. In [54], the universal filter or the quadrature oscillator can be obtained by adjusting the ratio of resistances while in [55]- [57], the universal filter or the quadrature oscillator can be obtained by adjusting the ratio of bias currents. It is well-known that the filters are commonly realized based on linear system whereas oscillators are generally realized based on non-linear system.…”

Section: Introductionmentioning

confidence: 99%

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Programmable Universal Filter and Quadrature Oscillator Using Single Output Operational Transconductance Amplifiers

2021

Informacije MIDEM

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This paper presents a new programmable universal filter and quadrature oscillator based on the single output operational transconductance amplifiers (OTAs). The proposed universal filter and quadrature oscillator can be achieved into single topology by programming analog switches. When the circuit performs as a universal filter, it can realize low-pass, high-pass, band-pass, band-stop and all-pass filters with orthogonal and electronic controls of the natural frequency and quality factor. When the circuit performs as a quadrature oscillator, it provides a three-phase quadrature output signal which the condition and frequency of oscillations can be controlled orthogonally and electronically. The proposed structure can be realized based on the single output OTAs which are easily implemented as both commercially available integrated circuits (ICs) as OTAs and complementary metal-oxide semiconductor (CMOS) OTAs as IC forms. SPICE simulation using standard 0.18 µm CMOS process is used for investigating the performance of the proposed circuit whereas the workability of new circuit is confirmed by LM13600 discrete-component integrated circuits as OTAs.

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Transimpedance type MOS-C bandpass analog filter core circuits

Cevik

Metin

Herencsár

et al. 2021

Analog Integr Circ Sig Process

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In this paper, we present six area-efficient transimpedance type second-order analog filters. There are many applications where the available signal is current, however the necessary signal for further processing is voltage type. For such applications the presented circuits will be a useful solution. The technique employed is called MOS-only technique and to the best of our knowledge this is the first attempt to implement transimpedance type filters with MOS-only technique. Starting from the core circuit biasing is illustrated and the functionality is shown with LT SPICE simulations using TSMC 0.18u technology parameters. From six core circuits one circuit is selected and the design is completed for illustration purpose.

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Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers

Cited by 15 publications

References 56 publications

Enhancing Q-Factor in a Biquadratic Bandpass Filter Implemented with Opamps

Enhancing Q-Factor in a Biquadratic Bandpass Filter Implemented with Opamps

Programmable Universal Filter and Quadrature Oscillator Using Single Output Operational Transconductance Amplifiers

Transimpedance type MOS-C bandpass analog filter core circuits

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