New Single VDCC-based Explicit Current- Mode SRCO Employing All Grounded Passive Components

Abstract

This paper proposes a new single resistancecontrolled sinusoidal oscillator (SRCO) which employs only onevoltage differencing current conveyor (VDCC), two groundedresistors and two grounded capacitors. The presented circuitconfiguration offers the following advantageous features (i)explicit current-mode output with independent control ofcondition of oscillation (CO) and frequency of oscillation (FO) (ii)low active and passive sensitivities and (iii) a very good frequencystability. The proposed structure can also be configured as (a)trans-admittance low pass filter and band pass filter and (b)quadrature oscillator. The validity of the proposed SRCO,quadrature oscillator and trans-admittance low pass filter andband pass filter has been verified by PSPICE simulations usingTSMC CMOS 0.18μm process model parameters.

A tunable immitance simulator with a voltage differential current conveyor

“…In this study we proposed an immitance circuit topology providing electronically tunable capacitor multiplier and grounded inductor using a single active element, one resistor and one capacitor. We used a voltage differential current conveyor (VDCC) that is a recently proposed and popular active element [13][14][15][16][17][18]. The presented topology does not have element matching restriction and employs minimum number of active and passive components.…”

Voltage differencing current conveyor based linearly controllable quadrature oscillators

“…Similarly complex single active element-based quadrature oscillator solution was presented in [9]. However, oscillator in [9] utilizes only one electronically controllable parameter (g m ) and does not offer such variability (CO and FO are adjustable only by variation of values of external grounded passive components) and FO is not tunable linearly. The work, dealing with VDCC used in oscillators, was published also by Rawat et al [10].…”

“…The work, dealing with VDCC used in oscillators, was published also by Rawat et al [10]. Similarly as in [9], VDCC concept employs only g m as adjustable parameter (but not used in application) and resulting structures of oscillators are very complex (two and more active devices). It is however not necessary in many cases.…”

Electronically Tunable Quadrature Sinusoidal Oscillator with Equal Output Amplitudes during Frequency Tuning Process

“…Also it requires dual output terminal VDCC ( and terminal). The simple current-mode oscillator using single VDCC and grounded passive elements was presented in [23]. The FO and CO can be orthogonally controlled.…”

“…The analog circuits using VDCC as active element have been found in the literature, for examples, universal filter [11][12][13][14], first-order all-pass filter [15], ladder filter [16], passive element simulator [10,[17][18][19][20][21], and square and triangular wave generator [22]. The VDCC-based sinusoidal oscillators have been proposed in [19,[23][24][25][26]. In [19], the Colpitts oscillator using VDCCbased capacitance multiplier was proposed.…”