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Configuraciones BJT

Three

less known are the configurations of BJT differential amplifier, current mirror and the Darlington amplifier. These circuits all require two transistors, Which Should Be the Same type and Have Closely matched for best performance parameters. These circuits require two transistors, which should be the same type and have been very close parameters for better performance. For clarity, all circuits Are Drawn Without bias circuits. For clarity, all circuits are made without bias circuits. Note That The Same dog Also Be circuits made with FET's and MOSFET's. Note that the same circuitry can also be done with FET's and MOSFET. If PNP transistors Are Used, power supply polarity reversed Should Be. When using PNP transistors, the power supply polarity must be reversed.


Differential Amplifier Differential Amplifier
The differential amplifier uses two matched transistors That share a common emitter connection. Often the emitter connection is connected via a single resistor for best performance But Should Be fed via a constant current source as Shown in the diagram. The differential amplifier uses two matched transistors that share a common emitter connection. The connection is usually connected issuer through a single resistor for better performance should be fed through a constant current source, as shown in the diagram. This circuit is Also known as a "long tailed pair." This circuit is also known as a "long-tailed pair." The circuit employs split and input supplies entre Can Be Either transistor and earth base or bases Applied Simultaneously to bother. The circuit used to divide the supplies and input can be between the base of the transistor and the ground or applied simultaneously to both bases. Used in this Manner the input signal amplified and Will Be Greatly Appear at the collectors. Used this way the input signal is highly amplified and displayed on the collectors. If a balanced input signal is Applied, say from long cables, Then We Will Be Any Interference on Each common wire. If a balanced input signal is applied from long cables that any interference is common in each cable. Same with A signal polarity Applied to Both differential inputs and amplified Will Not Be Known as this property is "common mode rejection." A signal with the same polarity is applied to both differential inputs are not amplified, and this property is known as "common mode rejection." The output Can Be Both taken from collectors (balanced) or entre Either collector and earth (unbalanced or single ended). The output can take two collectors (balanced) or between a collector and earth (unbalanced or single ended). Examples include DC amplifiers, instrumentation amplifiers and audio circuits, circuit example. Examples include DC amplifiers, instrumentation amplifiers and audio circuits, circuit example .

Current Mirror Mirror Current

Sometimes
Also known as a programmable current mirror this unusual configuration uses two matched transistors Closely With their bases in parallel. also sometimes known as a programmable current mirror is unusual configuration uses two transistors very close to their bases in parallel. The base current is Supplied via R1 and Will Have Both transistors identical base currents. The base current is supplied through R1 and transistors both have identical base currents. Are Because the matched transistors, and Have the Same forward current gain, collector current I _{Then 2} Will Be the Same as I ₁ . Because the transistors are matched, and have the same current gain interest, then the collector current I 2 be the same as I _1.

Amplifier Darlington Darlington Amplifier



The darlington amplifier circuit is a SP, and have the Advantage of Providing a very high current gain, high input impedance and Higher output power. The Darlington amplifier circuit is a useful and has the advantage of providing a very high current gain, high input impedance and higher output power. (It is Not NECESSARY to use matched transistors here) and Often you see a Small signal transistor driving to larger power transistor. The current gain is the product of Both Approximately Q1 and Q2 GAINS forward current. (It is not necessary to use transistors matched here) and is often a smaller transistor driving signal a larger power transistor. The current gain is approximately the product of both Q1 and Q2 earnings today forward. One point to note That is as Q1 Q2 emitter base is connected to the bias voltage V is required be1 + V be2 . A point to note is that, as an emitter of Q1 is connected to the Q2 base bias voltage required is V + V be2 _{BE1. This Must Be} taken Into account when to Designing bias circuits for the darlington amplifier. This should taken into account when designing circuits for amplifier bias Darlington.

PREPARED BY:

NERWIN ANTONIO MORA REINOSO

CI: 17,557,095

ESS SECTION 1