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Automatika : journal for control, measurement, electronics, computing and communications, Vol.56 No.2 October 2015. -

This paper presents two Current Differencing Transconductance Amplifiers CDTA-based current-mode resistors-less variable frequency third-order Quadrature Oscillators TOQO. The proposed TOQOs consist of minimum number of active and passive components, especially the first TOQO, only two CDTAs and three capacitors are used in it. The two TOQOs are completely resistor-less, and the capacitors used in the TOQOs are all grounded, which are ideal for monolithic integration. The condition of oscillation CO and frequency of oscillation FO of the TOQOs can be controlled electronically and independently, which make them suitable for variable frequency oscillator VFO. Moreover, the two TOQOs can provide four explicit quadrature current outputs at high output impedance terminals, and they can be directly cascaded with other current-mode circuits without any impedance matching requirements. Cadence IC Design Tools 5.1.41 post-layout simulation results and experimental evidence are included to confirm all the theory.

Kvadraturni oscilator trećeg reda; Cadence IC Design Tools; Shema

Autor: Jie Jin - ; aCollege of Information Science and Engineering, Jishou University, Jishou, 416000, PR.



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