Electrical Definitions

PAL : Abbervation for phase attenuation line. A colour TV system in which chrominance signal is resolved into the components in Quadrature relative phase of Quadrature components is reversed on alternate lines to minimize phase errors.

Parametric Amplifier : An amplifier for use at microwave frequencies in which the reactance of the device is varied in time by an altenating voltage called the pump voltage.

Paraphase Amplifier : An amplifier having two output signals which are 180 degrees out of phase with each other,often used to drive a push-pull amplifier stage.

Passive Components : The components which by themeselves are not capable of amplifying or processing an electrical signal e.g. resistors,capacitors or inductors.

Phase Lock Loop : A circuit which normally,automatically controls an oscillator so that it remains in a fixed phase relationship with a reference signal.It is used in a variety of applications such as tracking filter and frequency discriminators.

Piezo Electric Effect : An effect that occurs when certain materials are subjected to mechanical stress.An electrical polarization is set up in crystal and the faces of the crystal become electrically changed.

Pilot Synchronizing : A method of controlling the frequency of the local oscillator in suppressed carrier and allied systems of radio telephony by means of an auxuliary or pilot signal.

PIN : Connection point for logic integrated module.

Pixel : Pixel is a single cell in an image,usually represented as a bitmap of intensity values.It is the acronym for picture element.

Plasma Accelerator : An accelerator that forms a high-velocity jet of plasma by using a magnetic field, an electric arc,a travelling wave or other similar means.

Plasma Anodization : A method of making passive thin-film circuits by using a low-pressure gas plasma of oxygen ions as the electrolyte to anodize evaporated aluminium films on a glass substrate in a vaccum.

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