Single-resistance-controlled quadrature oscillator using current differencing buffered amplifiers

Abstract

A single-resistance-controlled quadrature oscillator circuit using current differencing buffered amplifiers (CDBAs) as active components is proposed. The proposed circuit is realised through the employment of two CDBAs, three resistors and two grounded capacitors. Outputs of two sinusoidal with 908 phase difference are available. The oscillation condition and the oscillation frequency of the proposed quadrature oscillator can be controlled independently by a single resistor. In comparison with the previously reported circuits, the proposed configuration considerably reduces the number of passive elements.

Design and Experimental Evaluation of Quadrature Oscillator Employing Single FB–VDBA

“…As a result, many quadrature oscillator circuits have been reported in the literature [9][10][11][12][13][14][15][16][17] using different type of active elements. Designers of quadrature oscillators utilize various active elements such as multifunction current differencing cascaded transconductance amplifier [9], current differencing transconductance amplifier (CDTA) [10], operational amplifier [11], current differencing buffered amplifier (CDBA) [12], current feedback operational amplifier (CFOA) [13], differential difference current conveyor (DDCC) [14], current follower transconductance amplifier (CFTA) [15], fully differential current conveyor (FDCCII) [16], and double current controlled current feedback amplifier (DCC-CFA) [17].…”

Quadrature Oscillator Design with Gm-C Structure

“…In the literature, there are many quadrature oscillators, which were designed with such active elements, as operational transresistance amplifiers [1], current feedback amplifiers [2], current differencing buffered amplifier [3,4], second generation current conveyor [5], current controlled current differencing buffered amplifier [6], current differencing transconductance amplifier [7], fully differential second generation current conveyor [8], fully balanced voltage differencing buffer amplifier [9]. Furthermore, surface acoustic wave oscillators [10] can be found.…”

“…Circuit realizations of the quadrature oscillators, given in [1], require some floating capacitors, which are not suitable for integrated circuit implementation. In [2][3][4][5][6][7], the operation requires at least two active elements and three passive components. In [8,9], quadrature oscillators consist of a single active element and at least three passive components.…”

Current and Voltage Mode Quadrature Oscillator Based on Voltage Differencing Buffered Amplifier

“…Different kinds of active elements have been used in quadrature oscillators up to now. Designers of quadrature oscillators utilize various active elements such as the positive, negative and inverting second generation current conveyor (ICCII-, CCII+, CCII-) [3][4][5], current differencing transconductance amplifier (CDTA) [6][7][8], current differencing buffered amplifier (CDBA) [9][10], operational amplifier [11], current feedback operational amplifier (CFOA) [12][13][14], differential difference current conveyor (DDCC) [15], fully balanced voltage differencing buffered amplifier (FB-VDBA) [16], also known as current backward transconductance amplifier (CBTA) [17], differential difference dual-X second generation current conveyor (DD-DXCCII) [18] and four terminal floating nullor (FTFN) [19][20][21].…”