Simple Oscillator with Enlarged Tunability Range Based on ECCII and VGA Utilizing Commercially Available Analog Multiplier

Abstract This work presents an example of implementation of electronically controllable features to an originally unsuitable circuit structure of oscillator. Basic structure does not allow any electronic control and has mutually dependent condition of oscillation (CO) and frequency of oscillation (FO) if only values of passive elements are considered as the only way of control. Utilization of electronically controllable current conveyor of second generation (ECCII) brings control of CO independent of FO. Additional application of voltage amplifier with variable gain in both polarities (voltage-mode multiplier) to feedback loop allows also important enlargement of the range of the independent FO control. Moreover, our proposal was tested and confirmed experimentally with commercially available active elements (“Diamond transistor”, current-mode multiplier, voltage-mode multiplier) in working range of tens of MHz.

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Condition of phase angle for a new VDGA-based multiphase variable phase shift oscillator from 0o to 90o

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v10i4.pp3801-3810 ◽

2020 ◽

Vol 10 (4) ◽

pp. 3801

Author(s):

Kasim K. Abdalla

Keyword(s):

Phase Angle ◽

Harmonic Distortion ◽

Cmos Technology ◽

Electronic Control ◽

Variable Phase ◽

Voltage Mode ◽

Condition Of Oscillation ◽

Simulation Results ◽

First Time ◽

Modern Building

A novel interesting type of variable phase angle voltage mode oscillator using modern building block has been presented in this paper. The new proposed oscillator configuration which uses four voltage differencing gain amplifier (VDGA) and two grounded capacitors can generate two sinusoidal signals that change out of phase by 0 to 90 degree. It has four floating and explicit voltage mode outputs where every two outputs have the same phase. The circuit is characterized by (i) the condition of phase angle of the oscillation (PO) (this concept is introduced for the first time in this paper) can be tuned electronically (ii) the gain of the floating outputs can be controlled independently (iii) it provides electronic control of condition of oscillation (CO) and independent control of frequency of oscillation (FO). The Total Harmonic Distortion (THD) of the output waveforms was obtained and the results were reasonability values (less than 4.5%). The non-ideal analysis and simulation results are investigated and confirmed the theoretical analysis based upon VDGAs implementable in 0.35μm CMOS technology. Simulation results include time response and frequency response outputs generated by using the PSPICE program.

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Three-Input Single-Output Electronically Controllable Dual-Mode Universal Biquad Filter Using DO-CCCIIs

Active and Passive Electronic Components ◽

10.1155/2007/36849 ◽

2007 ◽

Vol 2007 ◽

pp. 1-6 ◽

Cited By ~ 6

Author(s):

M. Siripruchyanun ◽

W. Jaikla

Keyword(s):

Integrated Circuit ◽

Current Mode ◽

Dual Mode ◽

Voltage Mode ◽

Single Output ◽

Biquad Filter ◽

Biquadratic Filter ◽

Circuit Description ◽

Electronically Controllable ◽

The Given

This article presents a dual-mode (voltage-mode and current-mode) universal biquadratic filter performing completely standard functions: lowpass, highpass, bandpass, band-reject, and allpass functions, based on plus-type dual-output second-generation, current controlled, current conveyor (DO-CCCII+). The features of the circuit are that the bandwidth and natural frequency can be tuned electronically via the input bias currents: the circuit description is very simple, consisting of merely 2 DO-CCCIIs and 2 capacitors: the circuit can provide either the voltage-mode or current-mode filter without changing circuit topology. Additionally, each function response can be selected by suitably selecting input signals with digital method. Without any external resistors, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is approximately 1.81 mW at±1.5 V supply voltages.

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Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA

ISRN Electronics ◽

10.5402/2012/382560 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 27

Author(s):

Dinesh Prasad ◽

D. R. Bhaskar

Keyword(s):

Current Mode ◽

Frequency Stability ◽

Good Frequency ◽

View Point ◽

Current Output ◽

Transconductance Amplifier ◽

Sinusoidal Oscillator ◽

Condition Of Oscillation ◽

Ready Availability ◽

Electronically Controllable

A new current-mode sinusoidal oscillator employing a single voltage differencing transconductance amplifier (VDTA), two grounded capacitors, and one grounded resistor has been proposed. The proposed sinusoidal oscillator offers the following advantageous features: (i) use of grounded capacitors which are attractive from the view point of IC implementation as well as eliminating/accommodating parasitic capacitances, (ii) independent control of frequency of oscillation and condition of oscillation, (iii) ready availability of explicit current-mode output, (iv) low active and passive sensitivities, and (v) a very good frequency stability. The workability of the proposed configuration has been established by PSPICE simulations.

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New Voltage-Mode Sinusoidal Oscillators Using VDIBAs

Journal of Circuits System and Computers ◽

10.1142/s0218126620500528 ◽

2019 ◽

Vol 29 (04) ◽

pp. 2050052

Author(s):

San-Fu Wang ◽

Hua-Pin Chen

Keyword(s):

Theoretical Analysis ◽

Bias Current ◽

Electronic Control ◽

Active Components ◽

Passive Components ◽

Voltage Mode ◽

Sinusoidal Oscillators ◽

Oscillation Condition ◽

Condition Of Oscillation ◽

Minimum Number

This paper presents two new voltage-mode sinusoidal oscillators based on voltage differencing inverting buffered amplifier (VDIBA). The first proposed circuit exhibits independent and electronic control of oscillation condition by using the bias current of the VDIBA. The proposed configuration contains only single VDIBA, two grounded capacitors and two resistors, which are the least number of active components and the minimum number of passive components necessary for realizing voltage-mode oscillator topology. The second proposed circuit exhibits independent and electronic control on the condition of oscillation without affecting the oscillation frequency by adjusting the separate bias currents of the VDIBAs. The proposed configuration contains two VDIBAs, two grounded capacitors and one resistor, which can provide four quadrature voltage outputs simultaneously. Both proposed circuits enjoy only two grounded capacitors, which are suitable for monolithic integration. HSpice simulations and experimental results are included to confirm the theoretical analysis.

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