Thermal resistance does not depend on the manufacturing technology
The units of thermal resistance is celsius per watt
The typical value of thermal resistance is 0.20 celsius per watt
Monday, March 9, 2015
Common emitter electronic devices and circuits
The common emitter configuration has the highest power gain
In common emitter configuration if the collector emitter voltage increases the instantaneous operating point moves up the load line
The purpose of the emitter resistance in common emitter amplifier is to decrease the voltage gain
Common base amplifier electronic devices and circuits
The common base transistor has got large voltage gain.
Among all other transistor configuration the common base configuration has the highest output impedance.
Among all other transistor configuration the common base configuration has the lowest input impedance.
Common base transistor provides a voltage gain.
Common base amplifier configuration provides the maximum voltage gain
The voltage gain of a common base amplifier is greater than unity.
Stability factor electronic devices and circuits
Given a fixed bias circuit the value of emitter resistance r1 r2 and beta then how to find the stability factor
Given a self bias circuit emitter resistance r1 and r2 and beta then how to find the stability factor
Given fixed bias circuit and the value of hsc then how to find out the stability factor
Given the value of emitter resistance and collector resistance base resistance and beta the type of bias is collector emitter feedback bias then how to find out the stability factor
Given a fixed bias circuit and the value of beta the value of the collector and emitter resistance is also given then how to find the stability factor
The value of stability factor cannot be less than 1
Common collector electronic devices and circuits
The common collector transistor amplifier configuration has got the largest current gain
The current gain of the emitter follower is less than unity
The other name of the emitter follower is the common collector transistor amplifier configuration.
The main application of emitter follower is it is used as an impedance matching device.
The reason why common collector transistor configuration is used for impedance matching is because it has got high input impedance.
Load line electronic devices and circuits
The graphical plot between the collector emitter voltage and the collector current is called a load line
In a given circuit the supply voltage is given
Which is the voltage at the collector is given the collector resistance is also given then at what
voltage the load line intersects the x axis
Given a particular circuit the supply voltage is given which is the voltage at the collector the collector resistance value is given then how to find out the value at which the load line intersects the y axis
Self bias circuit electronic devices and circuits
In self bias circuit the
resistor values r1 and r2 must be kept high
Given a self bias
circuit and emitter resistance and the values of r1 and r2 and also the value
of beta then what is the formula to find the stability factor
If there is zero dc
resistance in series with the collector resistance then self bias circuit can
be used
Emitter bias circuit is
also called as self bias circuit
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