Introduction: High-frequency DC-AC inverters as the LCC inverter shown in Fig. 1 are used in a variety of applications including electronic ballasts and induction heating. Input variations in both the bus voltage (amplitude modulation, AM) and the switching frequency (frequency modulation, FM) result in amplitude variations at the load. A common objective is to model the AC dynamics from input ...

Beckmann's theory of scattering from rough surfaces is applied to obtain, from the experimental veiling glare functions, a diffuser that when placed at the pupil plane would produce the same scattering halo as the ocular media. This equivalent diffuser is introduced in a schematic eye model, and its influence on the point-spread function and the modulation-transfer function of the eye is analyzed.

Published experimental measurements of the ocular modulation transfer function (MTF) in the peripheral field are approximated by the expression T(f) = exp[-(f/fc)n], where T(f), f, fc, and n are modulation transfer, spatial frequency, spatial frequency constant and MTF index, respectively. It is shown that n (which describes the shape of the MTF) remains relatively constant at about 0.9 for fie...

We present a globally stable arbitrary-order single-bit delta-sigma modulator architecture with continuous-time loop filtering. Using Lyapunov arguments and the method of equivalent control, it is shown that stability is guaranteed for any input signal with peak magnitude less than L > 0, where L and +L denote the quantization levels. The design augments the conventional deltasigma modulator wi...

This paper presents a detailed study of the clock jitter error in multi-bit continuous-time ΣΔ modulators with non-return-to-zero feedback waveform. It is demonstrated that jitterinduced noise power can be separated into two main components: one that depends on the modulator loop filter transfer function and the other dependent on input signal parameters, i.e. amplitude and frequency. The latte...

A technique for the exact design of the noise transfer function of Continuous-Time (CT) Sigma-Delta modulators with arbitrary and multiple DAC responses and real op-amps is here presented. The approach, that presupposes linear behavior of active blocks, produces a CT modulator with the same noise shaping as its DiscreteTime counterpart. The method operates entirely in the time domain and accoun...

A new technique for designing an LC bandpass DeltaSigma modulator is presented. This method is based on pulse shaping of a DAC output signal such that one can realize a desired (arbitrary) loop transfer function. Especially for higher-order modulators where extra LC sections are added, sufficient number of parameters are provided in the feedback loop. It is shown that by creating more degrees o...

A new modeling approach for the spectral analysis of pulsewidth modulated (PWM) converters with independent inputs is developed. The key of this approach is to extend the Volterra functional series to nonlinear systems with multiple independent inputs. After formulating the state-space equations describing the dynamical behavior of PWM converters, the Volterra transfer function characterizing t...

Class-E amplifier has the potential to deliver high efficiency required for the next generation wireless systems. In this journal, we discuss a novel load pull analysis technique to characterize the efficiency performance of Class-E amplifier in an outphasing power combining scheme. Class-E amplifier is not an ideal current or voltage source as is required for the traditional analysis of outpha...