Current-mode biquad without external passive elements

Tsukutani, Takao; Ishida, M.; Tsuiki, Sumio; Fukui, Yutaka

doi:10.1049/el:19960188

Cited by 89 publications

(20 citation statements)

References 3 publications

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“…The OA is an active element that produces the output with a very high-voltage gain [8]. It has been utilized in various applications, e.g., in amplifiers and filters.…”

Section: Oa As the Lossless Integratormentioning

confidence: 99%

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Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application

Prommee¹,

Manositthichai²,

Khateb³

2017

Turk J Elec Eng & Comp Sci

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Abstract:This research presents an active-only low-pass (LP) filter whose pole frequency and gain are independently tunable by means of bias current manipulation. The realization of the proposed LP filter required one operational amplifier, two operational transconductance amplifiers, and two MOS transistors. The multiphase sinusoidal oscillator (MSO) was subsequently realized by cascading n LP filters ( n = 3) and loop-backing the output of the last LP filter to the input of the first LP filter. Simulations were carried out and the results revealed that the MSO could simultaneously achieve low impedance voltage and high impedance current outputs without the circuit topology alteration. The frequency of oscillation and the condition of oscillation could also be electronically tuned without disturbing each other.Furthermore, the sinusoidal signal of the MSO exhibited relatively low total harmonic distortion of about 0.8% at 2.75MHz. To verify, a prototype of the active-only LP-based MSO ( n = 3) was constructed and experiments were performed.The experimental findings were agreeable with the simulation results.

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“…The OA is an active element that produces the output with a very high-voltage gain [8]. It has been utilized in various applications, e.g., in amplifiers and filters.…”

Section: Oa As the Lossless Integratormentioning

confidence: 99%

“…Meanwhile, the universal filters with only-active elements (i.e. without the passive elements) were proposed in [8,9]. It is an interesting method for realizing the filter * Correspondence: pipat@telecom.kmitl.ac.th by making it unnecessary to use the passive elements.…”

Section: Introductionmentioning

confidence: 99%

Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application

Prommee¹,

Manositthichai²,

Khateb³

2017

Turk J Elec Eng & Comp Sci

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“…This is attributed to their integratability, programmability and wide frequency range of operation [1,2]. The circuits reported in [1,2] can realise second-order lowpass, highpass, bandpass and notch transfer functions, without any matching or cancellation conditions. Realisation of allpass transfer functions is also feasible.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the realisation of an Nth-order response using the structure proposed in [1] requires 3N/20TAs and N OAs. It will be shown, in this paper, that an Nth-order response, with N=even integer, can be realised using N OAs and N+ 10TAs only.…”

Section: Introductionmentioning

confidence: 99%

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Multi‐Function Active‐Only High‐Order Current‐Driven Filter

Abuelma’atti

Alzaher

2000

Active and Passive Electronic Components

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A new multi-function high-order current-driven filter is proposed. The filter uses only operational amplifiers, and operational transconductance amplifiers (OTAs). Without using any external passive elements, a variety of high-order input-current/output-current and/or input-current/output-voltage responses can be realised without changing the circuit topology and without any matching or cancellation conditions. The parameters of the high-order filter responses can be electronically tuned by adjusting the bias currents of the OTAs.

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Multiple operating points in a square‐root domain first‐order filter

Blas

López-Martín

Carlosena

et al. 2006

Circuit Theory & Apps

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In this paper novel corrective circuits to avoid multiple operating points in a square-root domain first-order filter are proposed. By employing a DC test it is demonstrated that the filter possesses three operating points (two stable and one unstable) and the corrective circuits enforce the proper operating mode. The corrective circuits and filter are able to operate with very low supply voltages (as low as V GS + 2V DS sat ). Moreover, a detailed analysis concerning the impact that produces the corrective circuits on the filter performance is discussed. Both measurement and simulation results are provided to validate the circuits and analysis employed. circuit simulation packages resort to the well-known Newton-Raphson method, they are able to find only one DC operating point. Recent works are focused on finding MOP by using alternative methods [6, 7], but they are neither general nor easy to be implemented.In fact the existence of MOP is not only a problem for circuit analysis but also for circuit design. Particularly in continuous time implementations this behaviour needs to be avoided in order to enforce the correct operation mode at any time. However, very limited attention has been devoted to explore MOP [8,9] by circuit designers. To solve partially this lack of research, this paper focuses on a circuit designer-oriented treatment of the MOP problem that after achieving a detailed analysis of the circuit behaviour, it provides a solution at circuit level. This methodology is applied to a square-root domain (SRD) system that exhibits MOP, but it can be readily extended to other circuits.The SRD systems [10], a subset of the so called companding systems, are an interesting alternative to develop circuits with very low supply voltage (V DD <2V GS ) required in portable equipment and systems implemented by the most modern CMOS fabrication process [11]. The companding technique exploits the current mode and the large signal behaviour of transistors to achieve a non-linear compression of the voltage swings, allowing an extended dynamic range and less sensitive of the signal/noise ratio to the reduction of supply voltage. Although there is an internally non-linear behaviour in these systems the input-output relationships remain linear [12]. This fact is obtained implementing specific non-linear blocks in such a way that the linearization arises as a whole, i.e. the internal non-linearities cancel out conveniently leading to a linear system. Often these non-linear blocks are implemented employing translinear techniques [13,14]. The first companding systems were implemented employing BJT transistors (or MOS transistors in weak inversion) exploiting their exponential I -V characteristic leading to log-domain systems [15][16][17]. Afterward the systems were realized by the quasi-quadratic law of MOS transistors to avoid the problems of mismatches and poor bandwidth of MOS devices in weak inversion region, leading to SRD systems [18,19].In this paper a SRD first-order filter is designed based on the MOS translinear l...

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Current-mode biquad without external passive elements

Cited by 89 publications

References 3 publications

Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application

Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application

Multi‐Function Active‐Only High‐Order Current‐Driven Filter

Multiple operating points in a square‐root domain first‐order filter

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