A general class of current-mode high-order OTA-C filters

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

doi:10.1080/002072196136355

Cited by 32 publications

(19 citation statements)

References 9 publications

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“…Figure 9 shows the gain responses of the bandpass functions where I B is set to 40 µA, 80 µA, and 160 µA, respectively, and k = 0.3. This shows that the pole frequency can be adjusted without affecting the quality factor, as analyzed in (13) and (14). Figures 10 and 11 show simulated quadrature output waveforms where I B1 = I B2 = I B4 = I B5 = 100 µA and I B3 = 404 µA.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The operational transconductance amplifier (OTA) and second generation currentcontrolled current conveyor (CCCII) have received considerable attention as active components, because the transconductance and parasitic resistance can be adjusted electronically, which is especially suitable for analog circuits [3,14]. The flexibility of the devices to operate in both current and voltage modes allows for a variety of circuit designs.…”

Section: Introductionmentioning

confidence: 99%

“…The flexibility of the devices to operate in both current and voltage modes allows for a variety of circuit designs. Also, the application of dual-output current conveyors and the OTA has been useful for constructing current-mode circuits from a reduced number of active components [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Siripruchyanun

Jaikla

2008

Circuits Syst Signal Process

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This article introduces a circuit which can function both as a quadrature oscillator and as a universal biquad filter (lowpass, highpass, bandpass). When the circuit functions as a universal biquad filter, the quality factor and pole frequency can be tuned orthogonally via the input bias currents. When it functions as a quadrature oscillator, the oscillation condition and oscillation frequency can be adjusted independently by the input bias currents. The proposed circuit can work as either a quadrature oscillator or a biquad filter without changing the circuit topology. The amplitude of the proposed oscillator can be independently controlled via the input bias currents. The proposed oscillator can be applied to provide amplitude modulated/amplitude shift keyed signals with the above-mentioned major advantages. The circuit is very simple, consisting of four dual-output second generation current controlled current conveyors (DO-CCCIIs), one operational transconductance amplifier (OTA), and two grounded capacitors. Without any external resistors and using only grounded elements, this circuit is therefore suitable for IC architecture. PSPICE simulation results are depicted here, and the given results agree well with the theoretical analysis. The power consumption is approximately 7.32 mW at ±2.5 V supply voltages.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Siripruchyanun

Jaikla

2008

Circuits Syst Signal Process

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“…Although, the method produce filters that have n, single-ended OTAs and n, grounded capacitors, but they also require current amplifiers and buffers, increasing the complexity of the filter circuit. In [16], a general class of current-mode high-order OTA-C filters by employing a current-mode integrator and a proportional block as basic building units was proposed. It was shown that six OTAs and four grounded capacitors are required to realise a fourth-order filter.…”

Section: Out Imentioning

confidence: 99%

Analytical synthesis of current-mode high-order ota-c filters

Chang

Al-Hashimi

2003

IEEE Trans. Circuits Syst. I

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This paper presents a new general synthesis method for high-order current mode Operational Transconductance Amplifiers and Capacitors, (OTA-C) filters. The method is based on the analytical solution of a single, nth-order generic filter transfer function and the generation of n, number of realizable transfer functions implemented using lossless integrators. The method provides systematic synthesis approach to highorder OTA-C filters. Furthermore, the method generates circuits that are optimal in terms of components count, and without trading off any of the VLSI features of OTA-C filters. Simulation results are included validating the synthesis method.

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“…The transconductance operational amplifiers OTA1 and OTA2, [17], [18], forms digitally tunable ( programmable ) resistor. The value of this tunable resistor " Req " is given by: Of course, the inputs of the amplifier (V1&V2) are connected directly to the output of calibrated medical sensor.…”

Section: Hardware Implementationmentioning

confidence: 99%

Optimal design of experiment for medical sensors calibration

Amer

2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-This paper presents a framework for the optimal design of experiments for medical sensors calibration. A new software program, G-optimal, is developed to demonstrate the optimal design of experiment. This program has been used to find G-optimal design for amperometric enzyme glucose sensor, silicon capacitive absolute pressure sensors and electrochemical oxygen and carbon dioxide partial pressure sensors. The developed software improves the calibration accuracy, reduces the calibration cost, decreases the time and effort required performing a calibration and provides user friendliness.

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A general class of current-mode high-order OTA-C filters

Cited by 32 publications

References 9 publications

Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Analytical synthesis of current-mode high-order ota-c filters

Optimal design of experiment for medical sensors calibration

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