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an impedance common to both input and output can be slit into two (input alone and output alone) by using miller theorem.at the i/p side impedance multiplied by 1-gain and output side it is done by 1-1/gain.

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Q: What is miller capacitance?
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Increasing the capacitance of the coupling capicitor in an RC coupled amplifier has what effect?

the circuit will pass waves of a lower frequency


What is the miller effect in simple terms?

A: That becomes evident while the driving source i limited in current driving abilities the voltage increases the phenomenon occurs known as the miller effect. Once the threshold voltage is passed it begins to draw increasingly heavier drain current with respect to the gate. As the drain rises the trans conductance rises rapidly to saturation. concurrent with the rise in gain the once low feedback capacitance now swells to enormous proportions appearing as an additional to the input capacitance. cin=ciss+[1+av]cgd ciss= gate source in cap cgd=m gate drain capacitance av= voltage gain


Definition of a capacitance in mosfet?

Capacitance in mosfet is of three types: gate capacitance diffusion capacitance routing capacitance Gate capacitance: limits the speed of the device t which it can be operated Diffusion capacitance: It is the capacitance due to charge carriers between drain and source. Routing capacitance: It is the capacitance of the metal which is deposited on the top of oxide layer.


What is the stray capacitor?

Stray capacitance is undesired capacitance. Any electronic component (wires, resistors, etc.) has SOME capacitance; at high frequencies, this can become significant, becoming a problem for circuit design.


What is stray capacitance and how is different from ordinary capacitor?

Any two adjacent conductors can be considered a capacitor, although the capacitance will be small unless the conductors are close together for long. This (often unwanted) effect is termed "stray capacitance". Stray capacitance can allow signals to leak between otherwise isolated circuits (an effect called crosstalk), and it can be a limiting factor for proper functioning of circuits at high frequency. Stray capacitance is often encountered in amplifier circuits in the form of "feedthrough" capacitance that interconnects the input and output nodes (both defined relative to a common ground). It is often convenient for analytical purposes to replace this capacitance with a combination of one input-to-ground capacitance and one output-to-ground capacitance. (The original configuration - including the input-to-output capacitance - is often referred to as a pi-configuration.) Miller's theorem can be used to effect this replacement. Miller's theorem states that, if the gain ratio of two nodes is 1/K, then an impedance of Z connecting the two nodes can be replaced with a Z/(1-k) impedance between the first node and ground and a KZ/(K-1) impedance between the second node and ground. (Since impedance varies inversely with capacitance, the internode capacitance, C, will be seen to have been replaced by a capacitance of KC from input to ground and a capacitance of (K-1)C/K from output to ground.) When the input-to-output gain is very large, the equivalent input-to-ground impedance is very small while the output-to-ground impedance is essentially equal to the original (input-to-output) impedance.


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