Jordi Bonet-Dalmau

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We present a direct method for the steady-state and stability analysis of autonomous circuits with transmission lines and generic nonlinear elements. With the discretization of the equations that describe the circuit in the time domain, we obtain a nonlinear algebraic formulation where the unknowns to determine are the samples of the variables directly in(More)
This paper describes a technique for exploiting circuit instability to achieve baseband linear amplification. The input signal is periodically sampled by a first-order unstable circuit, and amplification is achieved by the exponentially growing natural response. A low-pass sampled amplifier response is achieved. An operational amplifier implementation of(More)
In this paper we investigate how to use controlled circuit instability in the filtering and amplification of narrow pulses. The basic circuit consists of a first-order RC network coupled to a negative resistance controlled by an external quench generator, which yields alternating periods of stability and instability. The study shows that when the circuit(More)
We extend a discrete-time approach for the analysis of the steady-state and local stability of nonlinear circuits, based on Gear discretizations, to compute the bifurcation boundaries of periodically forced nonlinear circuits. A bifurcation point may be detected by following a limit cycle solution as a function of a parameter until an eigenvalue crosses the(More)
Nonlinear switched circuits are usually analyzed in the time domain. The use of frequency-domain methods to analyze the steady-state of switched circuits is usually restricted to linear circuits and, although Volterra series approaches are applied to the distortion of nonlinear switched circuits, the use of harmonic balance (HB) methods in nonlinear(More)
This paper describes a bit-synchronous superregenerative receiver suitable for BPSK demodulation. The output of the superregenerative oscillator (SRO), which reproduces the phase information of the input signal, is directly sampled by a D flip flop clocked by a signal derived from the quench waveform. Analytical background on the response of the SRO to a(More)
In this paper we present a description and experimental verification of a superregenerative receiver (SR) for QPSK signals. Exploiting the fact that a conventional SR generates pulses which preserve the input phase information, we take N 1-bit samples of each generated pulse. A suitable choice of the sampling frequency gives as a result a bit vector(More)
Despite their simplicity, analysis and design of superregenerative oscillators is often still based on approximations which provide limited insight into its behavior. In this paper we investigate the superregenerative oscillator in the linear and logarithmic operation modes without any approximations. A frequency-domain formulation allows us to efficiently(More)
Previously published results on the operation of superregenerative receivers rely on some approximations to obtain analytic results. In this paper we investigate the linear superregenerative receiver in the sinusoidal steady state without any approximations. A frequency-domain formulation allows us to efficiently compute the relevant waveforms in the time(More)