Abstract
In this paper, a new compact voltage-mode four-phase oscillator employing single z-copy voltage differencing transconductance amplifier (ZC-VDTA) and only grounded passive elements is introduced. The use of only grounded capacitors and resistors makes the proposed circuit ideal for integrated circuit implementation. The condition of oscillation and the frequency of oscillation are independently adjustable. The passive and active sensitivities of the proposed circuit configuration are low. Experimental measurement results using readily available Maxim Integrated ICs MAX435 are given to prove the theory. DOI: http://dx.doi.org/10.5755/j01.eee.19.10.5900
Highlights
Sinusoidal oscillators are linear electric circuits that are used in wide area of electronics and represent an important unit in many radio receivers, telecommunication, instrumentation, control and data monitoring systems [1]– [3]
Research described in this paper was in part supported by the project SIX CZ.1.05/2.1.00/03.0072 from the operational program Research and Development for Innovation, by the project WICOMT CZ.1.07/2.3.00/20.0007 financed from the operational program Education for competitiveness, and Czech Science Foundation projects under No P102/11/P489 and P102/09/1681
Based on CM concept from [19], this paper presents the first VM four-phase quadrature oscillator using voltage differencing transconductance amplifier (VDTA) in the literature and its practical realization including amplitude gain control (AGC) circuit
Summary
Sinusoidal oscillators are linear electric circuits that are used in wide area of electronics and represent an important unit in many radio receivers, telecommunication, instrumentation, control and data monitoring systems [1]– [3]. It should be mentioned that in [5] and [7] additional voltage followers/inverters are needed In these circuits excessive number of ABBs is used. In 2008, set of new ABB concepts have been introduced [14] from them recently probably the voltage differencing transconductance amplifier (VDTA) received the most of attention [15]–[19]. To increase the universality of the conventional VDTA, the “z-current copy” technique is with advantage used, which was previously introduced for other circuit concepts [14]. Based on CM concept from [19], this paper presents the first VM four-phase quadrature oscillator using VDTA in the literature and its practical realization including amplitude gain control (AGC) circuit.
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