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Why emitter capacitor is called bypass capacitor?
The name Bypass Capacitor is used as it bypasses the high frequency components of power supply. It is also called as a Decoupling Capacitor as it decouples one part of the circuit from other (usually, the noise from power supply or other ICs is shunted and its effect is reduced on the other part of the circuit).
What is the purpose of the bypass capacitor?
Bypass capacitors are used to maintain low power supply impedance at the point of load. Parasitic resistance and inductance in supply lines mean that the power supply impedance can be quite high.
Why does an IC need a bypass capacitor?
Digital circuits certainly have a special aptitude for degrading power quality, but analog ICs also need bypassing to compensate for rapid output transitions and to protect them from power supply noise generated by other devices.
Can a circuit be run without a bypass capacitor?
A circuit without Bypass Capacitor or improper Bypassing can create severe power disturbances and may lead to circuit failure. Hence, an appropriate Bypass Capacitor must be used in the circuit. The following are a few considerations that must be taken into account when selecting a Bypass Capacitor.
What happens when DC is blocked by a capacitor?
Since DC is blocked by the capacitor, it will pass through the circuits instead of passing through the capacitor to ground. This is the reason; this capacitor is also known as Decoupling Capacitor. A circuit without Bypass Capacitor or improper Bypassing can create severe power disturbances and may lead to circuit failure.
Which is the best capacitor for bypassing power supply?
Hence, when selecting a capacitor for bypassing power supply from internal noise of the device (integrated circuit), a capacitor with low lead inductance must be selected. MLCC or Multilayer Ceramic Chip Capacitors are the preferred choice for bypassing power supply.