Effect of Negative feedback

Negative feedback affects the performance of amplifiers to achieve the desired performance such as stability of gain, input/output resistance, Distortion less output, increnment in bandwidth etc.  

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Basic Concept of Feedback

It is a process of mixing a part of output signal with the applied input signal. Signal mixed with the applied input will be proportional to the output, it is called feedback signal. When source signal and feedback signal are in same phase then it is called positive feedback. An amplifier can behaves as a oscillator … Continue reading Basic Concept of Feedback

Basics of Filters

Filter is a circuit designed to reject all unwanted frequency component of an signal and allows only desired frequencies. Broadly filters are categorized into two categories Active Filters :- These filters are made up of active elements (Devices which have internal amplification ability) such as Opamp, OTA, transistor etc. with addition to passive elements such … Continue reading Basics of Filters

Wiens Bridge Oscillator

Generally in an oscillator, amplifier stage introduces 180° phase shift and feedback network introduces additional 180° phase shift, to obtain a phase shift of 360° around a loop. This is required condition for any oscillator. But wiens bridge oscillator uses a non inverting amplifier and hence does not provide any phase shift during amplifier stage. As total phase … Continue reading Wiens Bridge Oscillator

Classification of Oscillators

The oscillators are classified based on the nature of the output waveforms, the parameters used, the range of frequency etc. The various ways in which oscillators are classified as : Based on the Output Waveform Under this, the oscillators are classified as sinusoidal and non sinusoidal oscillators. The sinusoidal oscillator generate purely sinusoidal waveform at … Continue reading Classification of Oscillators