Lecture 5 Flashcards
in DC biasing, the transistor is purely ____ operation.
DC
_______ in transistors are done to establish an operating point (Q point) which variations of current and voltage occur in response to an input signal.
DC analysis
It is designed to amplify small ac signals.
Small-signal amplifiers
It provides amplification of a signal without any distortion so that the output signal is an exact amplified replica of the input signal.
Linear amplifier
The ______ block DC and thus prevent the internal source resistance, RS, and the load resistance, RL, from changing the dc bias voltages at the base and collector.
Coupling Capacitors
It ideally appear as shorts to the signal voltage.
Capacitors
As the sinusoidal collector current increases, the _____ decreases.
Collector voltage
A transistor always produces a ________ between the base voltage and the collector voltage.
Phase inversion
The ______ varies along the AC load line, which is different from the DC load line because the capacitors are seen ideally as a short to the AC signal but an open to the DC bias.
AC signal
It is a combination of circuit elements, properly chosen, that best approximates the actual behavior of a semiconductor device under specific operating conditions.
Model
Out of the three ac transistor modes, the _____ became the more desirable approach.
re model
Output current is entering to the system rather than leaving, thus the _______must apply.
Negative sign
If Vo has the opposite polarity, a _______ must be apply.
Negative sign
It is the impedance “looking into” the system.
Zi or Input Impedance
It is the impedance “looking back into” the system.
Zo or Output Impedance
It reflects the operation of the BJT at mid-frequencies.
re model
It is an equivalent network that is used to predict the performance of the transistor amplifier.
re model
It represents the resistance looking into the emitter terminal of a transistor.
re
It controls the drain-to-source (channel) current of a JFET
gate-to-source voltage
It is the current-to-voltage ratio similar to the conductance of a resistor (1/R).
Conductance
The small signal analysis for D MOSFET and E-MOSFET is same as _____
JFET
