Frequency limitations of continuous-time OTA-C filters

Nevarez-Lozano, H.; Hill, James A.; Sánchez-Sinencio, E.

doi:10.1109/iscas.1988.15373

Cited by 23 publications

(10 citation statements)

References 5 publications

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“…For the OTA, the excess phase shift is a phase lag that can be modelled by assuming a time delay τ -\Ιω ι through the OTA [39]. For the OTA, the excess phase shift is a phase lag that can be modelled by assuming a time delay τ -\Ιω ι through the OTA [39].…”

Section: Effect Of Ota Nonidealirymentioning

confidence: 99%

Simulation of Active-only Floating Inductance

Abuelma’atti¹,

Khan²,

Alzaher³

1998

Frequenz

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A simple circuit for realizing active-only lossless floating inductor is presented. The circuit uses only two active elements; a dual output operational transconductance amplifier and an internally compensated operational amplifier. The circuit is suitable for monolithic implementation in either bipolar or MOS technologies. Simulation results of a high-order fowpass filter using two simulated lossless floating inductors are included. ÜbersichtBne einfache Schaltung zur Realisierung einer verlustlosen, erdfreien Induktivität wird vorgestellt. Sie ist ausschließlich aus zwei aktiven Elementen aufgebaut: einem Transkonduktanzverstärker mit zwei Ausgängen und einem intern kompensiertem Operationsverstärker. Sie eignet sich zur monolitischen Implementation in Bipolar-oder MOS-Technotogie. Simulationsergebnisse mit einem Tiefpaß höherer Ordnung, der zwei simulierte, verlustlose, erdfreie Induktivitäten enthält, sind beigefügt.Für die Dokumentation Induktivität / Simulation / aktive Elemente / Transkonduktanzverstärker / Operationsverstärker

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Section: Effect Of Ota Nonidealirymentioning

confidence: 99%

Simulation of Active-only Floating Inductance

Abuelma’atti¹,

Khan²,

Alzaher³

1998

Frequenz

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“…3, where Zrl is the parallel combination of Rol Ri2 Rd2 and (Col + Ci2 + Ca2 ) and Zr2 is the parallel combination of go2, Ril, gdl, and (Co2 + Cil + Cd). The model takes into consideration the frequency dependence of the transconductance, gin(s), which can be expressed as [8] gmi(S) gmoi exp(-sTi) (1) where Ti is the time delay through and gmoi is the dc transconductance of the ith OTA. For frequencies much lower than Ozi 1/T, (1) can be approximated by…”

Section: Proposed Circuitsmentioning

confidence: 99%

“…OTAs are, however, non-ideal in many respects. Of particular interest here is the output conductance, the output and input capacitances and the frequency dependence of the transconductance [7] and [8]. The equivalent circuit model of a non-ideal OTA operating in the linear region is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

New Minimum‐Component OTA‐Based Sinusoidal Oscillators

Abuelma’atti

Khan

1995

Active and Passive Electronic Components

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Using a general oscillator structure, new oscillator circuits are systematically derived. These oscillator circuits use two operational transconductance amplifiers (OTAs) and one externally connected passive element, exploiting the inherent zeros of the OTAs to advantage. The feasibility of obtaining oscillation using only two OTAs without externally connected passive elements is investigated. Experimental results are included.

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“…So, The sample and hold operation is implied in the integrator. The active resistor can be implemented with an OTA simulated resistor [4,8,9] or with a mode biased transistor based resistor [lo] or with a current source based resistor [ll].…”

Section: Introductionmentioning

confidence: 99%

A novel approach for the automatic tuning of continuous time filters

Silva-Martínez

Steyaert

Sansen

1991

1991 IEEE International Symposium on Circuits and Systems (ISCAS)

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A novel approach for the automatic tuning of Continuous-Time Filters (CTF) is introduced. This approach uses a charge comparison principle for the tuning of the pole frequency (coo) and the pulse response of a biquadratic filter for tuning the filter quality factor (Q). Both frequency and Q tuning are performed at lower frequency than the pole frequencies. Thus, these techniques reduce the tuning signal feedthrough in bandpass filters. The Q tuning include the filter high frequency effects. This Q tuning technique is well situated for narrow band filters. Simulated results and breadboard experimental results are presented and discussed.

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Frequency limitations of continuous-time OTA-C filters

Cited by 23 publications

References 5 publications

Simulation of Active-only Floating Inductance

Simulation of Active-only Floating Inductance

New Minimum‐Component OTA‐Based Sinusoidal Oscillators

A novel approach for the automatic tuning of continuous time filters

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