A new electronically tunable differential integrator (ETDI) and its extension to voltage controlled quadrature oscillator (VCQO) design with linear tuning law are proposed; the active building block is a composite current feedback amplifier with recent multiplication mode current conveyor (MMCC) element. Recently utilization of two different kinds of active devices to form a composite building ...

This paper presents a modified current differencing transconductance amplifier (MCDTA) and a MCDTA based quadrature oscillator. The oscillator is current-mode and provides current output from high output impedance terminals. The circuit uses only one MCDTA and two grounded capacitors, and is easy to be integrated. Its oscillation frequency can be tuned electronically by tuning bias currents of ...

Realisation scheme of a linear voltage controlled quadrature oscillator (LVCQO) using the new second generation conveyor (VCII) is proposed. The topology utilizes pair matched analog multiplier devices coupled appropriately with VCII, as active building block (ABB). oscillation frequency (fo) linearly tunable by control (V); experimental verification exhibits tuning-range upto fo∼10MHz measured...

Single LC oscillators are known for their good phase noise performance. In this paper we analyse the effect of cross-coupling two LC oscillators in order to provide quadrature outputs, which are mandatory in modern transceiver architectures. We present a theoretical study that shows that due to coupling a frequency shift exists and the oscillator quality factor is reduced, leading to a poorer p...

This paper presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two p-core Colpitts cross-coupled voltage-controlled oscillators (VCOs) with an LC ring resonator to provide the quadrature outputs. The proposed CMOS QVCO has been implemented with the TSMC 0.18μm CMOS technology and the die area is 0.478×0.82mm2. At the supply voltage of 1.5V, the total power consumpt...

This paper presents a complementary metal-oxidesemiconductor (CMOS) differential voltage-controlled oscillator (VCO) implemented with the push-push principle. The push-push VCO uses two frequency doublers stacked in series with an LC quadrature voltage-controlled oscillator (QVCO) to share the dc current with the QVCO for low power consumption. The proposed CMOS VCO has been implemented with th...

In this study, an electronically tunable resistorless dual-mode quadrature sinusoidal oscillator, based on current controlled current conveyor transconductance amplifier (CCCCTA) and two grounded capacitors is presented. The proposed resistorless oscillator employs a single CCCCTA and two grounded capacitors and thus is well suited for integrated circuit implementation. The proposed circuit is ...