It is a bias of a fixed voltage supplied by a separate low-power bias supply. Early radios used a 9 v tapped bias battery. In some amplifiers fixed bias can be dispensed with and the bias voltage is derived from one of the currents in the circuit.
Fixed Bias,Self Bias, Forward Bias, Reverse Bias
low input impedance
because we are not varying the biasing voltage
One of the main advantages of using the emitter bias configuration has to do with the Q-points. With changes in the current gain, those Q-points don't change. Since the collector current accounts for 99% of the emitter current, we come up with a 1% margin of error, much better than the 5% we can get with the fixed-base bias configuration and Ic and Vce do not fluctuate as well.
The VI characteristics of PN junction diode when used as a diode rectifier are reverse bias and rectification is shown by an asymmetrical current flow.
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of course stability of self bias circuit is much greater than fixed bias circuit
Fixed Bias,Self Bias, Forward Bias, Reverse Bias
characteristics of forward biased
negative feedback
Base resistor method (or) Fixed bias methodBiasing with feedback resistor (or) Collector to base bias methodVoltage divider bias (or) Self bias
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low input impedance
Various FET biasing circuits are as follows: 1. Fixed bias 2. Self bias 3. Potential divider bias 4. Current-Source bias
low input impedance
because we are not varying the biasing voltage
0V forward bias knee voltage0 ohm forward bias resistance0A reverse bias currentinfinite ohm reverse bias resistanceno parasitic capacitance or inductance