Design Of Sinusoidal Oscillator Research Articles

Electronically Tunable Sinusoidal Oscillator Using Only Single Current-Controlled Current Conveyor Trans-Conductance Amplifier

This work presents a wide frequency range sinusoidal oscillator design that relies on only one active component, a current-controlled current conveyor trans-conductance amplifier, and a few passive components. It just employs two grounded and non-floating capacitors and one resistor to complete the procedure. This design has the advantage of allowing the oscillation frequency and condition to be adjusted not only electronically, but also separately, without affecting the values of any passive components. To verify the functionality and usefulness of the developed sinusoidal oscillator circuit, ORCAD PSPICE simulations are done using 0.18 um process parameters for complementary metal oxide semiconductor technology. The obtained results demonstrate its application to a wide range of frequency generation without the need for additional components, hence validating the theoretical expectation.

1.2 V Sinh‐Domain allpass filter

AbstractA first‐order Sinh‐Domain allpass filter topology is introduced in this paper. It is constructed from a class‐AB current mirror and appropriately configured non‐linear transconductor cells. Due to the inherent class‐AB nature of Sinh‐Domain filters, the proposed topology offers the capability for handling currents at levels greater than that of the dc bias current level. Also, it offers the well‐known features of companding filters such as electronic adjustment of its frequency characteristics and the capability for operation in a low‐voltage environment. In addition, a four‐phase sinusoidal oscillator design example has been provided. The behaviour of the proposed topology has been evaluated and compared with other already known configurations, where the most important performance factors have been considered. Copyright © 2013 John Wiley & Sons, Ltd.

Realizations of Grounded Negative Capacitance Using CFOAs

The paper presents new realizations of grounded negative capacitance, using current feedback operational amplifiers (CFOAs), two resistors and one capacitor. All the proposed realizations are canonic in the number of passive components and do not require any critical component matching condition. Application examples in capacitive cancellation schemes and resistance-controlled low-frequency quadrature sinusoidal oscillator design are provided. The workability of the circuits has been verified by PSPICE simulations.

A simple methodology for sinusoidal oscillator design based on simulation of differential equation using AD844 configured as second-generation current conveyor

The work presented in the paper develops a methodology for the design of sinusoidal oscillator based on simulation of differential equation using second generation current conveyors. A practical circuit using the IC AD844 configured as current conveyor (CCII+) with CMOS analog switch DG201 illustrates the methodology. Experimental results are given. The scheme is suitable for frequencies below 1MHZ.

A simple methodology for sinusoidal oscillator design based on simulation of differential equation using AD844 configured as second-generation current conveyor

The work presented in the paper develops a methodology for the design of sinusoidal oscillator based on simulation of differential equation using second generation current conveyors. A practical circuit using the IC AD844 configured as current conveyor (CCII+) with CMOS analog switch DG201 illustrates the methodology. Experimental results are given. The scheme is suitable for frequencies below 1MHZ.

An Introduction to the Design of Filters and Sinusoidal Oscillators

After making a review of existing first-year laboratory work at Manchester Metropolitan University dealing with active filters, the authors describe an alternative set of first-year experiments which cover the three first-order filters whose transfer functions are controlled by a single time constant (first-order STC filters), namely, lowpass, highpass and allpass. The allpass filter can be regarded as an elementary parallel-path circuit with zero-order feedforward and this technique is extended to develop lowpass-to-highpass and highpass-to-lowpass converters which as well as allpass filters can be employed in the design of sinusoidal oscillators whose oscillation frequency can be adjusted using two similar grounded elements. Two approaches to the design of one such oscillator are given and experimental results are provided.

Nonlinear analysis of the Colpitts oscillator and applications to design

This paper reports a methodological approach to the analysis and design of sinusoidal oscillators based on bifurcation analysis. The simple Colpitts oscillator is taken as an example to demonstrate this nonlinear approach for both the nearly sinusoidal and chaotic modes of operation. In particular, it is shown how regular and irregular (chaotic) oscillations can be generated, depending on the circuit parameters.

Synthesis of first-order active-R allpass networks and their application in sinusoidal oscillator design

An active-R oscillator is described which uses two cascaded allpass networks. Equal-amplitude quadrature outputs are available, and the oscillation frequency is controlled by a pair of equal grounded resistors. This makes the design useful for electronic variation of frequency or for digital programming of frequency using programmable resistor arrays.

Simulations for sinusoidal oscillators with random numbers and initial impulses

A discrete-time-domain numerical method for simulating complete sinusoidal oscillator properties is discussed. Two modes for the spontaneous starting of oscillations can be simulated. The first mechanism results from the remnant electrical noise in the circuit, and the second mechanism is due to the transients when the power supply is switched on abruptly. The amplifier nonlinearities, as well as the automatic amplitude control function, can also be incorporated into the simulation. Very efficient computational algorithms for the major classes of real oscillators are presented. Experimental results show the accuracy of the simulated results. It is suggested that this simulation method can be used as a powerful tool for both transient and steady-state analysis, and for the design of sinusoidal oscillators.

High-frequency design of sinusoidal oscillators realised with operational amplifiers

The use of slew-rate models for designing RC active oscillators is discussed. It is shown that a precise modelling of the oscillator behaviour is obtained for frequencies beyond the ordinary application range of operational amplifiers. Based on that model, a design procedure is developed, and it is applied in the paper to the design of Wien-bridge oscillators, giving theoretical as well as practical results. Low-distortion oscillations may be obtained up to 100 kHz using standard operational amplifiers.