Transistor biasing
- The proper flow of zero signal collector current and maintenance of proper VCE ( collector to emitter ) voltage during entire AC signal is known as transistor biasing.
The transistor biasing is done in order to keep
- Base – emitter junction always forward biased
- Collector – emitter junction remains reverse biased
Biasing Circuit
- The faithful amplification of transistor amplifier circuit is done by biasing circuit and this is provided by placing bias battery ( DC voltage ) at the input side of the transistor.
- The circuit which provides transistor biasing is called as transistor biasing circuit.
Essential condition for biasing circuit
The following conditions must be necessary in order to
faithful amplification.
- Proper flow of zero signal collector current
- It should be ensure that the collector to emitter voltage should not fall below 1 V for silicon transistor and 0.5 V for germanium transistor.
- Stabilize of operating point
Biasing Methods
- Base resistor method
- Emitter bias method
- Collector feedback resistor bias method
- Voltage divider ( Universal bias ) method
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