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Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
Schrodinger wave equation (SWE) üamplitude of a reflected or transmitted wave to that of an incident wave. The subscripts of a typical coefficient Si j refer to the output and input ports related by the coefficient. These coefficients are generally frequency-dependent and are relative at a specified set of input and output reference planes. The scattering matrix is defined with respect to a specific set of port terminations (normalizations). Physical interpretations can be given to the scattering coefficients; for example, Si2j is the fraction of available power at port i due to a source at port j. The incident and reflected wave amplitudes at port i, ai , and bi , respectively, are obtained from the voltage and current, Vi , Ii , at the same port as ai = 1 |ReZ i |-1/2 (Vi + Z i Ii ) 2 of the presence of objects from their features, projective invariance properties, analysis of the play of light on surfaces, including approaches such as texture analysis, and many other types of procedure. scheduler a part of the operating system for a computer that decides the order in which programs will run. scheduling in an operating system, scheduling of CPU time among competing processes. schematic a diagram that shows how an electronic device is constructed. schematic capture a design entry method wherein the designer draws the schematic of the desired circuit using a library of standard cells. The program outputs a netlist of the schematic. schematic diagram a circuit diagram, divorced of biasing subcircuits, that depicts only the dynamic signal flow paths of an electronic circuit. Schmoo plot an X-Y plot giving the pass/fail region for a specific test while varying the parameters in the X and Y coordinates. Schottky barrier diode a two-terminal junction barrier device formed by a junction of a semiconductor and a metal. These diodes are widely used in integrated circuit applications and in very high frequency mixer and multipliers. Also called hot-carrier diode. Schottky contact a metal-to-semiconductor contact where, in order to align the Fermi levels on both sides of the junction, the energy band forms a barrier in the majority carrier path. Schottky noise scene analysis the process of analyzing a 3-D scene from 2-D images. Typically, this process will involve object and feature detection, inference See shot noise.
Design and Development of FM and PM Receivers Using Autocorrelation Technique
Published in IETE Journal of Research, 2022
Tosicul Wara, Karri V. R. Dinesh Kumar Reddy, Usha Bhandiwad
The basic block diagram of the autocorrelation-based FM and PM demodulator is shown in Figure 1. The circuit in Figure 1 is basically an autocorrelator, where the frequency mixer acts as an analog multiplier. However, to prove analytically in a simpler way that the circuit acts as an FM or a PM demodulator, it is better to consider that the mixer acts as a phase detector. With modulated signal input, the phase detector output voltage, which is proportional to the input phase difference, will contain the modulating signal (for FM signal input) or its derivative (for PM signal input) along with a DC offset and some higher frequency components. Consequently, by putting a bandpass filter (BPF) at the mixer’s output, one could recover the modulating baseband signal (or its derivative).