DIFFERENTIAL AMPLIFIER WITH SWAMPING RESISTOR PDF

Maran Which transistor array is essential in construction of a mir Which of the following AC parameters of an Op-amp results in What is the connection configuration of swamping resistor in DC analysis is exactly same as that of first case. The output voltage gain in this case is given by The voltage gain is half the gain of the dual input, balanced output differential amplifier. The output is referred to as an unbalanced output because the collector at which the output voltage is measured is at some finite dc potential with respect to ground. A differential amplifier is actually a very advanced … and good!

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Not having received a formal electronics engineering education nor being part of an assorted online community, that question lingered for quite a while unanswered — until yesterday. The ideal differential amplifier The differential amplifier DA is an electronic element which compares two input voltages and outputs their difference, multiplied by a certain factor.

The amplifier is ideal in that it detects even the smallest difference between input A and input B. Doing so would cause many problems, starting with a much reduced operation voltage for the follower circuit, reduced power and possibly noise. But they turn out to have a surprising ability… Current mirror, source Wikipedia The circuit above mirrors the reference current Iref so that the output current Iout is always equal to it.

If the input resistance changes for whatever reasons, and however fast , Q2 will change its conductivity so that Iout adjusts accordingly.

Now image what would happen if we replaced the resistance in the circuit with a transistor… Current mirror as differential amplifier T1 and T2 are PNP transistors and form together a current mirror. T3 acts as a regulating valve which increases the current through the current mirror as Input A gets more power while T4 kind of does the opposite by draining current from the mirror with increasing input B power.

The result is quite fascinating as the amplification is very close to the ideal amplifier. Now… would this work in reality? Maybe, maybe not. Like most of the circuits I post about, I run this one only on circuit. The referenced Wikipedia entry about current mirrors states that manufacturing tolerance is crucial to current mirrors.

Realistic designs are usually more complex than the one showed here in order to counter error margins, and are based on integrated circuits which have greater consistency in their operational characteristics. Share this:.

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A differential amplifier built with a current mirror

If we consider the base emitter voltage, V BE, as the input and the collector current, IC, as the output figure The base can be directly driven by the voltage output of the I-to- V converter we just discussed. The collector provides the output terminal of our simple current mirror: The output V to I converter stage of the simple current mirror is just a transistor acting as a non-linear exponential for BJT voltage-to-current converter. Again if a MOS transistor were used for the input stage the output stage would be a MOS transistor with the gate serving as the voltage input and the drain as the current output.

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What would you use to convert 12v Dc to 6v Dc? It depends on the load current and the required regulation range. There is not enough information in the question to narrow the answer down. If you want specifics, please restate the question and say more about the requirements. Why you use resistor in amplifier circuit? Resistors come under passive electronic components and are extensively used in electronic circuits. So important are these components that it may be virtually impossible to build an amplifier circuit without involving resistors.

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What is the connection configuration of swamping resistor in case of a differential amplifier ?

Not having received a formal electronics engineering education nor being part of an assorted online community, that question lingered for quite a while unanswered — until yesterday. The ideal differential amplifier The differential amplifier DA is an electronic element which compares two input voltages and outputs their difference, multiplied by a certain factor. The amplifier is ideal in that it detects even the smallest difference between input A and input B. Doing so would cause many problems, starting with a much reduced operation voltage for the follower circuit, reduced power and possibly noise.

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