Download Analysis and Design of Quadrature Oscillators (Analog by Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, PDF

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

The next are a few positive aspects of research and layout of Quadrature Oscillators make it assorted from the present literature on digital oscillators: (1) specialize in quadrature oscillators with exact quadrature and coffee phase-noise, required by way of smooth communique platforms; (2) a close comparative learn 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 impact of mismatches at the phase-error and the phase-noise; (4) the realization that quadrature RC oscillators could be a sensible substitute to LC oscillators while zone and value may be minimized (in cross-coupled RC oscillators either the quadrature-error and phase-noise are lowered, while in LC oscillators the coupling raises the phase-noise.

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The circuit of Fig. 25 is referred to as a passive mixer; although having an active element, the transistor, this acts as a switch, and does not provide gain. This type of mixers, 30 2 Transceiver Architectures and RF Blocks Fig. 25 Mixer using a switch vLO vRF vIF RL typically has no DC consumption, has high linearity and high bandwidth, and is suitable for use in microwave circuits. There are other possible implementations, as shown in Figs. 27, which, by contrast, provide gain, and reduce the effect of noise generated by subsequent stages; they are referred to as active mixers.

18 we present an example of an RC relaxation oscillator. This oscillator has been referred to as a first order oscillator, since its behaviour can be described in terms of first order transients [8, 44]. It operates by alternately charging and discharging a capacitor between two threshold voltage levels that are set internally. The oscillation frequency cannot be determined by the Barkhausen criterion (this is not a linear oscillator) and it is inversely proportional to capacitance. 2 LC Oscillator In order to illustrate the Barkhausen criterion, the LC oscillator can be used because it is a quasi-linear oscillator.

The theoretical amplitudes are 2I R = 600 mV and the simulated amplitudes are about 400 mV. 1 << 1), the amplitudes should also change 10%. The simulated vINT2 vINT1 ΔV ΔV Fig.

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