Download e-book for kindle: Analysis and Design of Autonomous Microwave Circuits (Wiley by Almudena Suarez

By Almudena Suarez

ISBN-10: 0470050748

ISBN-13: 9780470050743

Offers simulation concepts that considerably raise designers' keep watch over over the oscillationin self sustaining circuits
This publication allows a valid realizing of the free-running oscillation mechanism, the start-up from the noise point, and the institution of the steady-state oscillation. It bargains with the operation rules and major features of free-running and injection-locked oscillators, coupled oscillators, and parametric frequency dividers.
Analysis and layout of self reliant Microwave Circuits provides:
An exploration of the most nonlinear-analysis equipment, with emphasis on harmonic stability and envelope temporary methods
Techniques for the effective simulation of the commonest self sufficient regime
A presentation and comparability of the most stability-analysis equipment within the frequency domain
A distinct exam of the instabilization mechanisms that delimit the operation bands of self sufficient circuits
Coverage of options used to dispose of universal different types of undesired habit, reminiscent of spurious oscillations, hysteresis, and chaos
A thorough presentation of the oscillator section noise
A comparability of the most methodologies of phase-noise analysis
Techniques for self sustaining circuit optimization, in keeping with harmonic balance
A attention of alternative layout ambitions: presetting the oscillation frequency and output strength, expanding potency, editing the temporary length, and enforcing operation bands
Analysis and layout of self sufficient Microwave Circuits is a necessary source for microwave designers, oscillator designers, and graduate scholars in RF microwave layout.

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Additional resources for Analysis and Design of Autonomous Microwave Circuits (Wiley Series in Microwave and Optical Engineering)

Sample text

The local maxima of µ(v) increase with |v(t)| until steady state is reached. In steady state, both v(t) and the damping term µ(v) = [a + G + 3bv 2 (t)]/C exhibit periodic oscillation. As can be seen, the cubic nonlinearity provides a good model of the physical reduction of the device negative conductance when increasing the voltage amplitude across its terminals. This is why it is often chosen for a simple mathematical description of the oscillator behavior. The circuit capability to self-sustain a steady-state oscillation is explained as follows.

To prevent the short circuiting of frequency components ω = ωAG , the voltage generator is connected in series with an ideal bandpass filter, fulfilling Zf (ω = ωAG ) = 0 and Zf (ω = ωAG ) = ∞. The ratio between the current auxiliary generator current IAG flowing into the circuit, and the voltage delivered, VAG , provides the function YAG (VAG , ωAG ). 7 Small-signal admittance analysis of the FET-based oscillator of Fig. 6. 2 GHz, so the startup of an oscillation at about this frequency can be expected for this particular design.

As will be shown, this increase in the frequency selectivity is very convenient for a low phase noise design, as well as the lower sensitivity (for CT ∼ = Cs ) to active device elements, subject to noise fluctuations. 6 FET-based oscillator. 25 V. The capacitive termination CT , together with the feedback capacitance Cf b , provide negative resistance at the drain port. The circuit topology matches the schematic representation of Fig. 5. The voltage auxiliary generator, connected in parallel at the transistor output node, is used for various analysis techniques presented in this chapter.

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Analysis and Design of Autonomous Microwave Circuits (Wiley Series in Microwave and Optical Engineering) by Almudena Suarez


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