We discussed small signal analysis of BJT under the key word "Small signal analysis". When input signal to an amplifier is in the range of ten to hundred Kilo Hertz, a small signal-low frequency model of the transistor can be used for analysis. But as the frequency increases, internal capacitance of the transistor will strongly effect it's performance. A low frequency model cannot work well in this situation. To accommodate these performance changes of the transistor, a separate model is developed for high frequency operations. This high frequency model is given in Fig 1. A high frequency hybrid-pi model is also known as Giacoletto model.
Easy Analog Circuit
Analog Circuits(Electronics circuits) is in B Tech syllabus for AEI, ECE and EEE. Blog is exclusively for S3ns; enlighten all concepts and circuits in detail and also make it lighter. However has a limited scope within the syllabus, explanations beyond it are omitted.
Sunday 13 December 2015
Friday 11 September 2015
Integrator & Differentiator-B Tech university Question & answer
Q1. Explain the working of RC low pass filter, how it can be act as an integrator.
Answer key: circuit(2), working+fre response(4), act as integrator(5), output(1) (12 marks)
To know, how to prepare answer key, visit link.
Answer:
Consider a first order RC circuit. It can be act as a low pass filter and allows to pass only the low frequency signals.
Answer:
Consider a first order RC circuit. It can be act as a low pass filter and allows to pass only the low frequency signals.
Friday 20 February 2015
Small Signal - Low frequency - Analysis of common collector amplifier-continue
Analysis of amplifier circuit includes derivation of equation for 1)input resistance 2)output resistance 3)voltage gain and 4)current gain. Derivation and analysis of input resistance is given in - 'Analysis of Common Collector amplifier (Emitter Follower) -begins here' . Remaining parameters will be discussed here.
Before beginning, recollect the common collector amplifier circuit and it's small signal model. It was discussed in detail in the -'begins here' post. For your convenience once again giving the circuits.
Here is the amplifier circuit:
Here is the amplifier circuit:
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fig 1 |
Tuesday 10 February 2015
Small Signal-Low frequency- Analysis of Common Collector amplifier (Emitter Follower) -begins here
We are very familiar with common collector circuits- otherwise known as Emitter follower. Collector terminal is common to both input side and output side. During analysis, we are finding out the nature(characteristics) of the circuit by observing it's input and output resistances, voltage gain and current gain. Here discussing the analysis of CC amplifier using low frequency - small amplitude signals.
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