Multi-function Current Differencing Cascaded Transconductance Amplifier (MCDCTA) and Its Application to Current-Mode Multiphase Sinusoidal Oscillator

Abstract

In this study, a new versatile active element, namely multifunction current differencing cascaded transconductance amplifier (MCDCTA) is proposed. The proposed MCDCTA enjoys the advantages of low voltage, low-input and high-output impedance, wide bandwidth etc., and 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, a new current-mode multiphase sinusoidal oscillator (MSO) using the proposed MCDCTA is described in this paper. The proposed MSO consists only one MCDCTA and minimum grounded passive elements, it could provide 2n (n ] 2) output current signals with equally phase difference, and the output current signals are all at high output impedance terminals. The oscillation condition and the oscillation frequency of the MSO could be linearly and electronically adjusted by controlling the bias currents of MCDCTA, and it is suitable for variable frequency oscillator application. The operation of the proposed oscillator has been verified through PSPICE simulation and experimental results.

Single CDCTA Based Electronically Adjustable Current-mode Quadrature Sinusoidal Oscillator

“…The ratio of output current I o1 and I o2 is obtained as follows: (14) The effect of the parasitic resistance and capacitance in CDCTA is also studied in this section. Taking into account these parasitic elements, the characteristic equation of the proposed oscillator was presented as below [Equation (15)]: (15) where , , , and .…”

Methods and Strategies for 3D Content Creation Based on 3D Native Methods

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