Analysis And Design Of Autonomous Microwave Circuits by Almudena Suarez

By Almudena Suarez

Offers simulation concepts that considerably raise designers' keep an eye on over the oscillationin self sufficient circuits

This ebook enables a valid figuring out of the free-running oscillation mechanism, the start-up from the noise point, and the institution of the steady-state oscillation. It offers 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 independent regimes

  • A presentation and comparability of the most stability-analysis equipment within the frequency domain

  • A designated exam of the instabilization mechanisms that delimit the operation bands of self sustaining circuits

  • Coverage of thoughts used to dispose of universal kinds of undesired habit, reminiscent of spurious oscillations, hysteresis, and chaos

  • A thorough presentation of the oscillator part noise

  • A comparability of the most methodologies of phase-noise analysis

  • Techniques for independent circuit optimization, according to harmonic balance

  • A attention of alternative layout targets: presetting the oscillation frequency and output energy, expanding potency, enhancing the brief period, and implementing operation bands

Analysis and layout of self sustaining Microwave Circuits is a useful source for microwave designers, oscillator designers, and graduate scholars in RF microwave design.

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Additional resources for Analysis And Design Of Autonomous Microwave Circuits

Example text

Note that the shape and period of the waveform are independent of these initial conditions. They satisfy the mathematical conditions for the self-sustained oscillation with zero net energy consumption. Nonautonomous circuits such as amplifiers and frequency multipliers are ruled by differential equations having coefficients with explicit time dependence. As an example, consider the parallel connection of an independent current generator ig (t) to a parallel RLC resonator. This circuit is governed by the linear equation v(t) ¨ + Gv(t)/C ˙ + 1/(LC)v(t) − (dig (t)/dt)/C = 0, with the independent term dig (t)/dt.

In the case of the impedance function tan(ang(Zp (ω)) = 2σω/(σ2 + ω2o − ω2 ) for positive σ, the phase associated with Zp (ω) has positive slope at the resonance frequency ωo . The function Z(ω) agrees with the inverse of the total admittance analyzed, YT (ω) = YTr (ω) + j YTi (ω). In terms of YT (ω), it is possible to write tan(ang(Zp (ω))) = −YTi (ω)/YTr (ω). Assuming a small frequency variation of YTr (ω), a resonance of the form YTr (ωo ) < 0, YTi (ωo ) = 0, ∂(YTi (ωo ))/∂ω > 0 will give rise to a positive slope of the phase associated with Z(ω), corresponding to a pair of unstable complex-conjugate poles.

This is due to the absence of an independent periodic generator at the same frequency ωo , establishing a phase reference. When this is the case, the coefficients of the differential equations ruling circuit behavior have no explicit time dependence, so any arbitrary time shift of the periodic waveform provides another solution. In the frequency domain, the different time shifts correspond to different phase origins, as φ = ωo (τ − τ). 2. The first real equation, Re[YT ] = 0, implies balance between average T power delivered and consumed, as resulting from T1 0 v(λ)i(λ)dλ = 12 Re[YT ]Vo2 , with T being the oscillation period T = 2π/ωo .

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