Tunable current-mode and voltage-mode quadrature oscillator using a DVCCTA

Abstract

A novel tunable current-mode and voltage-mode quadrature oscillator design using a single differential voltage current conveyor transconductance amplifier (DVCCTA) and four all grounded passive elements is presented. The proposed circuit offers two explicit quadrature current outputs and two quadrature voltage outputs. The oscillation condition and oscillation frequency of the proposed oscillator are independently controllable. The use of only grounded passive components makes the proposed circuit ideal for integrated circuit implementation. HSPICE simulation results are given to verify the theoretical analysis.

Behavioral model for emulation of ZC-CG-VDCC

“…This device also contains current conveyor but difference of two input voltages V p and V n is provided by internal operational transconductance amplifier (OTA) [11,12] connected to Y terminal of current conveyor forming the second stage of the circuit. The discussed principles spread also to other advanced active elements, see for example [13,14].…”

Electronically tunable allpass filter: linear VCO design

“…A relevant comparative summary to this extent is presented in Table I. It may be seen that albeit electronically tuned QVCOs are also proposed earlier [10,26,27,28,29,30,31,32], but such an oscillator based on electronically tunable AP filters with linear tuning law had not yet been presented, as is seen by the comparative description in Table I below.…”

Voltage-variable inductor based linear voltage controlled quadrature oscillator implementation

“…Albeit quite a number of electronically tunable quadrature oscillators had been reported in recent past [5,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29], only a few have a linear tuning law as listed in Table II. These are mostly tuned by bias current (I b ) of some trans-conductance device, which attracts issues of thermal voltage (V T ) and quiescent dissipation.…”