Electronics Engineering - What is difference between Fixed-Bias Circuit & Self-Bias Circuit?

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What is difference between Fixed-Bias Circuit & Self-Bias Circuit?

Total Answers and Comments: 2

Last Update: October 29, 2007 Asked by: DUSHYANT PRATAP SINGH

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Submitted by: Waleed Shinwari

Fixed bias circuits get their bias voltages from independently designed reference voltage sources (or even something as simple as a voltage divider). Often is the case that the bias may be left for the end-user to give some control over the operation point of the circuit.

Self biased circuits get their bias voltages from the circuit itself, often in the form of a negative feedback. This is very useful when a circuit is extremely sensitive to bias points and it becomes impractical to provide external biases that are correct to very high accuracies. This can happen in high gain amplifiers with very high impedance output nodes, such as a common source amplifier with an active load. The operation of the circuit dependson the bias of the active load. It would therefore be desirable to sacrifice some of this gain by providing a negative feedback from the output to the gate of the active load. This way, you wont have to bias the circuit yourself, but will lose some of the gain of the circuit as a price.

Waleed

Above answer was rated as good by the following members:
hemakrishna.p

October 13, 2007 18:48:17

Waleed Shinwari

RE: What is difference between Fixed-Bias Circuit & Se...

Fixed bias circuits get their bias voltages from independently designed reference voltage sources (or even something as simple as a voltage divider). Often is the case that the bias may be left for the end-user to give some control over the operation point of the circuit.

Self biased circuits get their bias voltages from the circuit itself, often in the form of a negative feedback. This is very useful when a circuit is extremely sensitive to bias points and it becomes impractical to provide external biases that are correct to very high accuracies. This can happen in high gain amplifiers with very high impedance output nodes, such as a common source amplifier with an active load. The operation of the circuit dependson the bias of the active load. It would therefore be desirable to sacrifice some of this gain by providing a negative feedback from the output to the gate of the active load. This way, you wont have to bias the circuit yourself, but will lose some of the gain of the circuit as a price.

Waleed

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October 29, 2007 05:05:10

sagar61

Member Since: September 2007 Contribution: 10

RE: What is difference between Fixed-Bias Circuit & Se...

fixed bias ckt is a ckt whose value can't be changed i.e has two resistors of same value.

self bias resistor are those whose resistance value can be varied

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