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Answer given by Sehdev Kumar B.Teh. 1st year
DC Bias voltage is what one would apply to an AC signal to make all parts of the signal have the same polarity. One application of DC bias is in amplification. The audio signal from a microphone or detector is an AC signal, with both positive and negative polarities at different times. A transistor cannot amplify negative and positive voltages, so a DC bias is applied to the signal causing the entire signal to be either positive or negative. The transistor can then amplify this signal and after amplification, the DC component is removed. Another application might be in setting the switch point of a comparator - a device that has two output states which are determined by the voltage at the input.
bias voltage is the voltage which make circuit conductive or you can say that when we apply voltage through bais in transistor it make current flowing in emitter and collector and make whole circuit conductive. it is mostly used as voltage controlled current source
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What are the types of FET biasing circuit?
Various FET biasing circuits are as follows: 1. Fixed bias 2. Self bias 3. Potential divider bias 4. Current-Source bias
Why high value resistor used in reverse bias diode circuit?
In a reverse bias condition of a circuit current initially remains the same for low voltage but at the breakdown voltage current increases fast even for a small increase in voltage.hence.........
Why is it necessary to bias a transistor when it is to be used as an amplifier?
Biasing is necessary in a transistor circuit to keep the transistor working. Without proper biasing, the circuit will fail
When a 10mA forward bias current and the voltages at the anode and cathode of a diode in a circuit are found to be the same what is the diode most likely to be?
With a 10mA forward bias current, if the voltages at the anode and cathode of a diode in a circuit are found to be the same, then the diode most likely to be shorted.
How is Half wave rectifier experiment?
halfwave rectifier converts ac to pulsating dc.in half wave rectifier we use only one diode.during forward bias condition the circuit is open and hence conducts hence we get +ve half cycles where in reverse bias condition the circuit is open and hence doesn't conducts.
Why emitter bias circuit is called self bias circuit?
emitter bias provides a feedback to the circuit so that circuit remains in linear regionn
Which stability is greater between self bias and fixed bias?
of course stability of self bias circuit is much greater than fixed bias circuit
Why emitter bias circuit is called self bias?
The emitter bias circuit is called self-bias because the bias voltage across the emitter-resistor is based on the transistor's own characteristics. The bias voltage adjusts itself based on the varying collector current to stabilize the operating point of the transistor. It is a self-adjusting mechanism that helps maintain a stable bias point for the transistor.
What are the applications of fixed bias circuit?
low input impedance
What are the types of FET biasing circuit?
Various FET biasing circuits are as follows: 1. Fixed bias 2. Self bias 3. Potential divider bias 4. Current-Source bias
What are the advantages of self bias on other bias?
1. stability factor s for voltage divider or self bias is less as compared to other biasing circuits . So this circuit is more stable and hence it is most commonly used. 2. this circuit is used where only moderate changes in ambient temperature are expected 3. the bias automatically adjusts to any variations in the circuit. by prerita agarwal
What are the applications of fixed bias amplifier circuit?
low input impedance
What are the characteristics of fixed bias?
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.
What is the difference between constant current bias and current mirror circuit?
current mirror circuit produce more stability as compared to biased circuit.
Why fixed bias circuit is called so?
because we are not varying the biasing voltage
Advantages and disadvantage of self bias circuit?
the advantage of self bias circuit will be stable for greater range of amplitude signal than the fixed biased amplifier circuit the disadvantage is it only partially effective and therefore is only used where moderate changes in ambient temperature are expected
What is the operation of potential divider bias?
Thevenization of the divider circuit will help you see how it operates.
