Oscillator idea
An oscillator is a positive feedback control system that generates an output without requiring an input signal. A sustained oscillation is initiated by factors such as noise pick–up or power supply transients. Along with the definition of the mathematical terms that describe an oscillator. The design equations of an oscillator are determined by analyzing the denominator of the transfer equation T(s) of the circuit. The poles of the denominator of T(s), or equivalently, the zeroes of the characteristic equation (?s), determine the time domain behavior and stability of the system. An oscillator is on the border line between a stable and an unstable system and is formed when a pair of poles are on the imaginary axis.
The magnitude and phase equations of an oscillator also must be analyzed. If the magnitude of the loopgain is greater than one and the phase is zero, the amplitude of oscillation will increase exponentially until a factor in the system, such as the supply voltage, restricts the growth. In contrast, if the magnitude of the loop-gain is less than one, the amplitude of oscillation will exponentially decrease to zero.
Operational amplifier oscillators can be used to produce a frequency that is proportional to resistive and capacitive sensors. Design equations defining the oscillation frequency are readily available for several common oscillators, such as Wein bridge and phase shift oscillators. However, detailed design equations that show the relationship of the resistors and capacitors are generally not available. Thus, there is a need for a design procedure that derives the equations in order to select the resistor and capacitor components that maximize the accuracy of the oscillation frequency.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .