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Module 8 - Introduction to Amplifiers
Navy Electricity and Electronics Training Series (NEETS)
Chapter 2:  Pages 2-31 through 2-35

COMBINATION PEAKING is accomplished by using both series and shunt peaking.


LOW-FREQUENCY COMPENSATION is accomplished in a video amplifier by the use of a parallel RC circuit in series with the load resistor.




to provide the required response at a given frequency.


The FREQUENCY-DETERMINING NETWORK in an RF amplifier provides maximum impedance at the desired frequency. It is a parallel LC circuit which is called a TUNED CIRCUIT


TRANSFORMER COUPLING is the most common form of coupling in RF amplifiers. This coupling is accomplished by the use of RF transformers as part of the frequency-determining network for the amplifier.



ADEQUATE BANDPASS is accomplished by optimum coupling in the RF transformer or by the use of a SWAMPING RESISTOR.
NEUTRALIZATION in an RF amplifier provides feedback (usually positive) to overcome the effects caused by the base-to-collector interelectrode capacitance.




A-1.   The difference between the upper and lower frequency limits of an amplifier.
A-2.   The half-power points of a frequency-response curve. The upper and lower limits of the band f frequencies for which the amplifier is most effective.
A-3.   (A) f2  = 80 kHz, f1  = 30 kHz, BW = 50 kHz (B) f2  = 4 kHz, f1  = 2 kHz, BW = 2 kHz
A-4.   The capacitance and inductance of the circuit and the interelectrode capacitance of the transistor.
A-5.   Negative (degenerative) feedback.
A-6.   It decreases.
A-7.   It increases.
A-8.   The capacitance of the circuit.
A-9.    Peaking coils.
A-10.   The relationship of the components to the output-signal path.
A-11.   Combination peaking.
A-12.   The coupling capacitor (C3).


A-13.   A shunt peaking coil for Q2.
A-14.   A decoupling capacitor for the effects of R2.
A-15.   A part of the low-frequency compensation network for Q1.
A-16.   A series peaking coil for Q1.
A-17.   A swamping resistor for L2.
A-18.   L1, L2, and R5.
A-19.   R9 and C5.
A-20.   The gain increases.
A-21.   The gain decreases.
A-22.   To provide maximum impedance at the desired frequency.
A-23.   Yes.
A-24.   By changing the value.
A-25.   Transformer coupling.
A-26.   It uses fewer components than capacitive coupling and can provide an increase in gain.
A-27.   A step-down transformer.
A-28.   A too-narrow bandpass.
A-29.   By using an optimally-coupled transformer.
A-30.   Low gain at the center frequency.
A-31.   A swamping resistor in parallel with the tuned circuit.
A-32.   RF transformers are used and the transistor is neutralized.
A-33.   Degenerative or negative.
A-34.   By neutralization such as the use of a capacitor to provide regenerative (positive) feedback.
A-35.  C2 and the secondary of T1.
A-36.   R1 provides the proper bias to the base of Q1 from VBB.
A-37.   R2 provides the proper bias to the emitter of Q1.
A-38.   The output would decrease. (C4 decouples R2 preventing degenerative feedback from R2.)
A-39.    C5 and the primary of T2.
A-40.   Four.


A-41.   The dotted lines indicate that these capacitors are "ganged" and are tuned together with a single control.
A-42.   C3 provides neutralization for Q1.


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