Question

In an amplifier electronic circuit that consists of a NPN type transistor, what is the direct polarization condition?

Answer #1

**To operate a transistor it must be polarized, that is to
say it applies different voltages on its pins E, B, C.**

The transistor is *blocked* when its two junctions are in
reverse bias .

The transistor is in *direct normal operation* when the
control junction BE is in direct polarization and the junction BC
is in reverse bias

The transistor is in *reverse normal operation* when the
control junction BE is in reverse bias and the junction BC is in
forward bias

The transistor is *saturated* when its two junctions are
in direct polarization.

In a two-story voltage amplifier circuit, there is PNP on the
first floor and NPN on the second floor. A total of 10 resistors
and a total of 5 capacitors were used in the circuit, 5 resistors
per floor. Re resistance of PNP transistor is 63.31 Ω and re
resistance of NPN transistor is 15.25 Ω. The input impedance of the
first floor is 212.36 Ω and the input impedance of the second floor
is 9.1 K Ω. There is...

TASK 1
a) You are given a 3-terminal device that looks like a NPN
transistor, but with a very high gain (beta). You suspect this is a
composite device, that is, it is made up of a few components inside
the enclosure. Draw a circuit which you propose might be the inner
structure of the device.
b) Consider the same NPN transistor circuit in part a).
Suppose the resistor R1 is placed between the collector and the
base, rather the...

What is the Miller effect? Explain how it arises in an NPN
transistor?

An Electronic Company is experimenting with the manufacturing of
a new type of transistor. Every hour a supervisor takes a random
sample of 10 transistors produced on the assembly line. The
probability that anyone transistor is defective is considered to be
0.25. The Company is interested in the number of defective
parts.
a) Find the probability that from a random sample of 10, there
are at most 2 defective transistors .
b) Compute the expected number and standard deviation of...

a)What is the formula for the gain of an inverting operational
amplifier circuit with input resistor Ri and feedback resistor Rf?
Draw the circuit.
b)What is the formula for the gain of a non-inverting
operational amplifier circuit with input resistor Ri and feedback
resistor Rf? Draw the circuit.
c)What is the gain of a voltage follower operational amplifier
circuit? What is the input impedance of this circuit? Draw the
circuit.

What is the function of an operational amplifier in the detector
circuit for a photodiode or phototube?

What are the major differences between a switching transistor
and a linear transistor?
note: please type answer

a) What are the inverse temperature coefficient transistor
parameters (2 units) used for temperature independent polarization
in a band-range reference circuit?
b) Write the general formula for the voltage reference in the
band-range circuits using the parameters you found in the (a)

What purposes might there be for implementing an amplifier
circuit with a gain near(or reasonably close to) 1 which also
doesn’t filter frequencies

1.
What is the resonant frequency of a series circuit which consists
of R=30ohms, C=100uF and L=0.1H. What is the impedance of this
circuit at resonance.
2. What is the resonant frequency of a parallel circuit which
consists of R=30ohms, C=100uF and L=0.1F. What is the impedance of
this circuit at resonance?
3. What is the Q at resonance of resonant frequency of a
series circuit which consists of R=30ohms, C=100uF and L=0.1H
4. What is another example of a...

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