Noise Analysis of Radio Frequency Circuits by Amit Mehrotra

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By Amit Mehrotra

In this publication, we be aware of constructing noise simulation thoughts for RF circuits.
The distinction among our method of acting noise research for RF circuits and the conventional innovations is that we first pay attention to the noise research for oscillators rather than non-oscillatory circuits. As a primary step, we improve a brand new quantitative description of the dynamics of strong nonlinear oscillators in presence of deterministic perturbations. in contrast to prior such makes an attempt, this description isn't constrained to two-dimensional procedure of equations and doesn't make any assumptions concerning the form of nonlinearity. via contemplating stochastic perturbations in a stochastic differential calculus surroundings, we receive an accurate mathematical characterization of the noisy oscillator output. We current effective numerical suggestions either in time area and in frequency area for computing the part noise of oscillators. This strategy additionally determines the relative contribution of the gadget noise resources to section noise, that is very worthy for oscillator design.

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Extra resources for Noise Analysis of Radio Frequency Circuits

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Response of an orbitally unstable oscillator A lossless LC tank with a finite energy stored in the tank is not an asymptotically orbitally stable system. The response of the oscillator describes a closed orbit in two-dimensional state space (formed by the capacitor voltage and inductor current). However, if the oscillator is perturbed by a small instantaneous change in the system energy, the system moves to a new limit cycle and never returns to its original limit cycle. Hence this is not an asymptotically orbitally stable system.

3 V21 1 + v21 1 = sm T ' ' 2wo which has a solution v2 1,1(T) = A 1 cos T + B 1 sin T - 16~0 sin 37 where A1 and B1 are constants yet to be determined. Requiring that v21,1 (7) = 0, we have A 1 = 0. Equating the coefficient of /-L 2 to zero we have II 1 210 II 2 (3 SlllTCOST-Slll ·. · 3TCOSTv ) I210 0 =w02v212 --v +woV212' 8 ' ' ' I - wo(4cos 2 T - 1)v21 ,1 or equivalently 11 V21 2 + v21,2 = -1-2 cosT + - 1 (4 cos 2 T - 1) ( B 1 cosT - -3- cos 3T ) ' 16w0 wo 16wo 1 + - 2 cosT sin 7(3 sin T- sin 37) 2w0 2 B 1 + - 1- ) COST+ (Bl - - 9 - ) cos3T wo 8wJ wo 16wJ 1 - --cos5T 16wJ = ( Since the coefficient of cosT should be zero for v21 (T) to have a periodic solution, B1 = -1/ (16wo) and the above equation reduces to 11 5 1 v 21 ,2 + v21,2 = - -2 cos3T- - -2 cos5T 8w0 16w0 which has a solution 5 1 v21,2( T) = A2 cosT+ B2 sin T + - -2 cos 37 + - 2 cos 57 64w0 384w0 Requiring that v21,2(0) = 25/(384wJ) we have A2 = -1/(64wJ).

Similarly for any initial condition inside the limit cycle, the phase plane trajectory goes to zero. , every solution x 8 ( t +a) for a E R is also orbitally stable. , ------ 0 ~ I C'l 1-l I -1 I I -2 ------ -3 -4 -3 -2 -1 0 2 Xt(t) Figure 3. 1. Response of an orbitally unstable oscillator A lossless LC tank with a finite energy stored in the tank is not an asymptotically orbitally stable system. The response of the oscillator describes a closed orbit in two-dimensional state space (formed by the capacitor voltage and inductor current).

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