Read e-book online Analysis and Design of Quadrature Oscillators (Analog PDF

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

ISBN-10: 140208515X

ISBN-13: 9781402085154

ISBN-10: 1402085168

ISBN-13: 9781402085161

The subsequent are a few positive aspects of research and layout of Quadrature Oscillators make it diversified from the prevailing literature on digital oscillators: (1) specialize in quadrature oscillators with exact quadrature and coffee phase-noise, required via glossy communique structures; (2) a close comparative research of quadrature LC and RC oscillators, together with cross-coupled LC quasi-sinusoidal oscillators, cross-coupled RC rest oscillators, a quadrature RC oscillator-mixer, and two-integrator oscillators; (3) an intensive research of the impact of mismatches at the phase-error and the phase-noise; (4) the belief that quadrature RC oscillators could be a functional substitute to LC oscillators while region and price will be minimized (in cross-coupled RC oscillators either the quadrature-error and phase-noise are decreased, while in LC oscillators the coupling raises the phase-noise.

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

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2 Phase-noise in Quadrature Relaxation Oscillators . . . . . . . . . . . . . Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction This chapter is dedicated to the study of quadrature relaxation oscillators, which consist of two cross-coupled RC relaxation oscillators [9]. In this book we will use interchangeably the designations cross-coupled relaxation oscillator and quadrature relaxation oscillator.

13) includes both phase and amplitude noise, and they can not be separated. However, practical oscillators have an amplitude stabilization mechanism, which strongly reduces the amplitude noise, while the phase-noise is unaffected. 13) is dominated by the phase-noise and L(␻m ) is known simply as “phase-noise”. The carrier-to-noise ratio (CNR) can also be used to specify the oscillator phasenoise. 2 Quality Factor The Quality Factor (Q) is the most common figure of merit for oscillators, and it is related to the total oscillator phase-noise.

4 Simulation Results We simulated the quadrature cross-coupled oscillator at a high level using ideal blocks with MATLAB, to confirm the amplitudes change predicted by the theoretical analysis. As shown in the block diagram of Fig. 14, we change the integration slope of the second oscillator by changing the Schmitt trigger outputs levels. When we increase the integration slopes in the second oscillator, the amplitude of the first oscillator decreases to follow the frequency of the second oscillator (Fig.

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Analysis and Design of Quadrature Oscillators (Analog Circuits and Signal Processing) by Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, Chris J. M. Verhoeven, Manuel M. Silva


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