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What is the current in a coupling circuit for high frequencies?
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∙ 11y ago
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∙ 11y ago
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How do the parasitic capacitance limit the high frequency operation of an integrated circuit?
Parasitic capacitance is the inherent capacitance between different planes of metal in a circuit. The main problem is that capacitors look like shorts to high frequencies, which can then simulate grounding shorts, line linkage, feedback paths and other generally undesirable features in the circuit. In particular, in ICs, the problem is 'crosstalk', wherein signals in one part of the IC induce a signal through capacitive coupling in another part of the circuit.
What does an fuse do in an circuit?
A fuse protects the (expensive) circuit for too high currents. When the current becomes too high the (cheap) fuse melts and the current is stopped, preferably before damage has been done to the circuit.
What causes an elecrtic current to flow in a circuit?
The movement of electron towards the high potential causes electric current to flow in a circuit.
Normally a high current flows through a short circuit even if there is no change to the voltage. Why is this?
A high current flows through a short circuit even if there is no voltage change because the resistance across the short circuit is zero.
If voltage is increased in a circuit what happens to current series and parallel respectively?
In this case current flows from a high voltage to a lower voltage in a circuit.
Does air core coupling better in transformer?
Magnetic coupling enables the transfer of power from primary winding to secondary. The induced voltage at the secondary is a function of d/dt of flux. For low frequencies, where dt is high, he flux required will be high. To achieve such high flux, a high permeabilty ( ewuivalent to conductance in electric circuit) magnetic path is required. By putting what we achieve is this only. By wood, the permeabilty comes down to 1/5000
What does the capacitor in a low pass filter do?
Does not allow high frequencies to pass through the circuit.
What is the purpose of a blocking capacitor?
At high frequency, capacitor can be considered as 1. Short Circuit in AC analysis. 2. Open Circuit in DC analysis. {because Xc= 1/(2*f*pi) where f= supply frequency,pi=3.14} As at high frequencies, in DC analysis, capacitor will be open circuited & can block the DC signal while AC signal is allowed to pass through.. Hence, this capacitor will act as a blocking capacitor for DC supply.
How do the parasitic capacitance limit the high frequency operation of an integrated circuit?
Parasitic capacitance is the inherent capacitance between different planes of metal in a circuit. The main problem is that capacitors look like shorts to high frequencies, which can then simulate grounding shorts, line linkage, feedback paths and other generally undesirable features in the circuit. In particular, in ICs, the problem is 'crosstalk', wherein signals in one part of the IC induce a signal through capacitive coupling in another part of the circuit.
Is the current in a series circuit high all the way round?
That depends on what you call "high".Whether or not you consider it high, the current is the same all the way around a series circuit.
Why might the current in a short circuit be higher than the current in the original circuit?
The current in a short circuit may be very high because the resistance in the short circuit is probably less than the resistance in the original circuit.
When is the current flowing in a circuit said to be very small?
When the current flowing in a circuit is very small the resistance will be very high.
What does an fuse do in an circuit?
A fuse protects the (expensive) circuit for too high currents. When the current becomes too high the (cheap) fuse melts and the current is stopped, preferably before damage has been done to the circuit.
What causes an elecrtic current to flow in a circuit?
The movement of electron towards the high potential causes electric current to flow in a circuit.
Normally a high current flows through a short circuit even if there is no change to the voltage. Why is this?
A high current flows through a short circuit even if there is no voltage change because the resistance across the short circuit is zero.
A dangerous circuit with low resistance and high current?
Another name for a circuit with low resistance and high current is a short circuit. It is dangerous because, if you have sufficient energy in the power source, you can damage components and/or cause fires.
Why ordinary diodes dont work properly At high frequencies?
Because of stray capacitance. At very high frequencies, the inter-electrode capacitance has a low enough impedance that the diode no longer cuts off when reverse-biased, there is still significant conduction via capacitive coupling. High-frequency diodes are constructed so as to minimize this capacitance.
