Analysis and Design of Quadrature Oscillators (Analog - download pdf or read online

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 gains of study and layout of Quadrature Oscillators make it diverse from the present literature on digital oscillators: (1) concentrate on quadrature oscillators with exact quadrature and occasional phase-noise, required by means of sleek communique structures; (2) an in depth comparative examine 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 influence of mismatches at the phase-error and the phase-noise; (4) the belief that quadrature RC oscillators could be a sensible replacement to LC oscillators while zone and price might 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)

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Phase-Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Phase-noise in a Single Relaxation Oscillator . . . . . . . . . . . . . . 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 Fig. 21 the small signal model of the differential pair is shown. Since the circuit is symmetric, the controlled sources have the currents shown in Fig. 28) Thus, the differential pair realizes a negative resistance (Fig. 21) that compensates the losses in the tank circuit. 5 Mixers Mixers are a fundamental block of RF front-ends. Nowadays, a research effort is done to realize a fully integrated front-end, to obtain cost and space savings. 5 Mixers 27 of combining the LNA and the mixer [45] has been considered.

2). Thus, we should substitute the integrator and the Schmitt trigger by simple circuits that ensure some correspondence between the high level and the circuit level. The integrator is implemented simply by a capacitor (Fig. 3); its input is the capacitor current (i C ) and the output is the capacitor voltage (νC ). This voltage is the input of the Schmitt-trigger (Fig. 4), the output of which is i C . The transfer characteristic of the Schmitt-trigger is shown is Fig. 4b. It is assumed that the switching occurs abruptly when the sign of νBE1 − νBE2 changes.

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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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