Improved resonator phase shift in passive and active coupled LC Quadrature Oscillator

Chaharboor, Marzieh; Ghonoodi, Hojat

doi:10.1109/iraniancee.2017.7985500

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…Various types of high-frequency oscillators are widely used in instrumentation measurement and radio communications for producing a sinusoidal signal with constant amplitude and frequency of oscillation not less than 100 kHz. An analysis of the literature of the last few years has shown a wide variety of oscillators, some of which are implemented using transistors (BJTs or FETs) [1][2][3][4][5], and others using different types of monolithic operational amplifiers (op-amps) [6][7][8][9][10][11][12][13][14]. For the circuits with discrete transistors, the DC operating point is set using resistor dividers and coupling capacitors, while for the circuits with integrated transistors, current sources and a system of current mirrors are used, which in many cases complicates the amplitude and frequency setting of the output signal.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Self-Limiting Two-Stage LC Oscillators Using Cascade Structure of Monolithic CCIIs as Active Elements

Pandiev

2023

Energies

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This paper presents the structure and principle of operation of two circuit configurations of self-limiting LC oscillators using monolithic positive second-generation current conveyors (CCII+s), that are implemented using Current-Feedback Operational Amplifiers (CFOAs) with an available compensation pin (Z). The proposed LC oscillators are synthesized using a systematic approach in the design of analog electronic circuits and can be considered as variants of the basic three-point oscillators, implemented using transistors (BJTs or FETs). Based on the analysis of the structure and electrical parameters of the CFOAs with a compensation pin (Z), electronic circuits of oscillators with two-stage amplifier blocks are synthesized. The characteristic equations and self-oscillation conditions are derived for the obtained analog circuits, and recommendations for designing circuits with arbitrary frequencies are defined. To verify the efficiency of the proposed LC oscillators, an experimental study is performed in the frequency range from 100 kHz to 10 MHz. The CFOAs AD844A with an external terminal z of the internal current conveyor are used as active elements. The obtained experimental results well match the results of the simulation modelling and the parameters based on the derived analytical expressions. The developed LC oscillators are intended to be used in schematic configurations of gas sensors based on surface acoustic wave (SAW) resonators.

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