High-output-impedance current-mode multiphase sinusoidal oscillator employing current differencing transconductance amplifier-based allpass filters

AbstractIn this study, a new versatile active element, namely multifunction current differencing cascaded transconductance amplifier (MCDCTA), is proposed. This device which adopts a simple configuration enjoys the performances of low-voltage, low-input and high-output impedance, wide bandwidth etc. It simplifies the design of the current-mode analog signal processing circuit greatly, especially the design of high-order filter and oscillator circuits. Moreover, an example as a new current-mode multiphase sinusoidal oscillator (MSO) using MCDCTA is described in this paper. The proposed oscillator, which employs only one MCDCTA and minimum grounded passive elements, is easy to be realized. It can provide random n (n being odd or even) output current signals and these output currents are equally spaced in phase all at high output impedance terminals. Its oscillation condition and the oscillation frequency can be adjusted independently, linearly and electronically by controlling the bias currents of MCDCTA. The operation of the proposed oscillator has been testified through PSPICE simulation and experimental results.

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Electronically Tunable Quadrature Oscillator Using Grounded Components with Current and Voltage Outputs

The Scientific World JOURNAL ◽

10.1155/2014/572165 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Hua-Pin Chen

Keyword(s):

Integrated Circuit ◽

Output Impedance ◽

Passive Components ◽

Quadrature Oscillator ◽

Oscillation Condition ◽

Transconductance Amplifier ◽

High Output Impedance ◽

Electronically Tunable ◽

Current Differencing Transconductance Amplifier ◽

High Output

The electronically tunable quadrature oscillator using a single multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA) and grounded passive components is presented. The proposed configuration uses a single MO-CCCDTA, two grounded capacitors and one grounded resistor. Two high-output impedance quadrature current signals and two quadrature voltage signals with 90° phase difference. The oscillation condition and oscillation frequency of the proposed quadrature oscillator are independently controllable. The use of only grounded passive components makes the proposed circuit ideal for integrated circuit implementation.

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OFC based high output impedance current mode SIMO universal biquadratic filter

2011 International Conference on Multimedia, Signal Processing and Communication Technologies ◽

10.1109/mspct.2011.6150456 ◽

2011 ◽

Cited By ~ 3

Author(s):

T. Parveen

Keyword(s):

Current Mode ◽

Output Impedance ◽

Biquadratic Filter ◽

High Output Impedance ◽

High Output

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High output impedance current-mode first-order allpass networks with four grounded components and two CCIIs

International Journal of Electronics ◽

10.1080/00207210600711580 ◽

2006 ◽

Vol 93 (9) ◽

pp. 613-621 ◽

Cited By ~ 36

Author(s):

J.-W. Horng ◽

C.-L. Hou ◽

C.-M. Chang ◽

W.-Y. Chung ◽

H.-L. Liu ◽

...

Keyword(s):

Current Mode ◽

Output Impedance ◽

First Order ◽

High Output Impedance ◽

High Output

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GROUNDED CAPACITOR CM-APS WITH HIGH OUTPUT IMPEDANCE

Journal of Circuits System and Computers ◽

10.1142/s0218126607003861 ◽

2007 ◽

Vol 16 (04) ◽

pp. 567-576 ◽

Cited By ~ 8

Author(s):

SUDHANSHU MAHESHWARI

Keyword(s):

Current Mode ◽

Bias Current ◽

Output Impedance ◽

Quadrature Oscillator ◽

Pspice Simulations ◽

First Order ◽

External Bias ◽

High Output Impedance ◽

High Output

This paper presents a new first order current mode all-pass section (CM-APS) with a grounded capacitor and employing a modified current controlled conveyor. The new circuit with high output impedance is ideal for current-mode cascading and is tunable through an external bias current. The proposed circuit is unique due to its features, not exhibited by any of the available works on the topic. An application of the circuit in realizing a quadrature oscillator is also given. The theory is validated through PSPICE simulations using real device transistors.

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Versatile Tunable Current-Mode Universal Biquadratic Filter Using MO-DVCCs and MOSFET-Based Electronic Resistors

The Scientific World JOURNAL ◽

10.1155/2014/515348 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7

Author(s):

Hua-Pin Chen

Keyword(s):

Current Mode ◽

Angular Frequency ◽

Input Current ◽

Current Conveyors ◽

Output Impedance ◽

Output Circuit ◽

Single Output ◽

Biquadratic Filter ◽

High Output Impedance ◽

High Output

This paper presents a versatile tunable current-mode universal biquadratic filter with four-input and three-output employing only two multioutput differential voltage current conveyors (MO-DVCCs), two grounded capacitors, and a well-known method for replacement of three grounded resistors by MOSFET-based electronic resistors. The proposed configuration exhibits high-output impedance which is important for easy cascading in the current-mode operations. The proposed circuit can be used as either a two-input three-output circuit or a three-input single-output circuit. In the operation of two-input three-output circuit, the bandpass, highpass, and bandreject filtering responses can be realized simultaneously while the allpass filtering response can be easily obtained by connecting appropriated output current directly without using additional stages. In the operation of three-input single-output circuit, all five generic filtering functions can be easily realized by selecting different three-input current signals. The filter permits orthogonal controllability of the quality factor and resonance angular frequency, and no inverting-type input current signals are imposed. All the passive and active sensitivities are low. Postlayout simulations were carried out to verify the functionality of the design.

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