By Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, Chris J. M. Verhoeven, Manuel M. Silva

The next are a few positive factors of research and layout of Quadrature Oscillators make it assorted from the present literature on digital oscillators: (1) specialise in quadrature oscillators with actual quadrature and coffee phase-noise, required by way of glossy verbal exchange platforms; (2) a close comparative research of quadrature LC and RC oscillators, together with cross-coupled LC quasi-sinusoidal oscillators, cross-coupled RC leisure oscillators, a quadrature RC oscillator-mixer, and two-integrator oscillators; (3) an intensive research of the impression of mismatches at the phase-error and the phase-noise; (4) the belief that quadrature RC oscillators could be a functional replacement to LC oscillators while sector and value can be minimized (in cross-coupled RC oscillators either the quadrature-error and phase-noise are diminished, while in LC oscillators the coupling raises the phase-noise.

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Additional info for Analysis and Design of Quadrature Oscillators (Analog Circuits and Signal Processing)

Example text

We consider that the new values of capacitances, and charge and discharge currents, occur by deviation from their ideal values. When all changes have sequentially been considered we redo the calculations and obtain the same amplitude at the beginning and at the end of the period, which shows that the circuit is in steady state oscillation. 3 Quadrature Relaxation Oscillator Fig. 7). The charging current at this instant becomes I2C . 9) The capacitor in the first oscillator, with capacitance C, continues to discharge after t = 0, with current I.

The circuit of Fig. 6a, with this 90◦ out of phase output, is itself a quadrature generator, but it has an open-loop structure, in which the output signals have different paths, so there is an error in the quadrature relationship. However, the softlimiter output can be used to synchronize a second relaxation oscillator. Coupling two oscillators using this technique leads to a cross-coupled relaxation oscillator in a feedback structure (Fig. 7) [8]. In the cross-coupled oscillator there is not a master and a slave oscillator: both oscillators trigger each other in a balanced structure.

LC oscillators are usually quasi-linear oscillators. They can use as resonator element: dielectric resonators, crystals, striplines, and LC tanks. These oscillators are known by their good phase-noise performance, since Q is normally much higher than one. In this book we are interested in oscillators capable to produce two outputs in accurate quadrature. We will study relaxation RC oscillators and LC oscillators with an LC tank (usually called simply LC oscillators), because they can be cross-coupled to provide quadrature outputs.

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