NEETS 7.txt

Four classes of amplifier operations

Class ___ amplifiers are biased so that variations in input signal polarities occur within the limits of CUTOFF and SATURATION.

A

Amplifiers designed for class ___ operation are biased so that collector current is zero (cutoff) for a portion of one alternation of the input signal

AB

Amplifiers biased so that collector current is cut off during one-half of the input signal are classified class __.

B

In class ___ operation, collector current flows for less than one half cycle of the input signal

_____ is the faithful reproduction of a signal.

Fidelity

The ________ of an amplifier refers to the ratio of output-signal power compared to the total input power.

efficiency

___________ is the most frequently used configuration in practical amplifier circuits, since it provides good voltage, current, and power gain.

COMMON-EMITTER CONFIGURATION (CE)

______________ is mainly used for impedance matching, since it has a low input resistance and a high output resistance. It also has a current gain of less than 1.

COMMON-BASE CONFIGURATION (CB)

The ___________ is used as a current driver for impedance matching and is particularly useful in switching circuits.

COMMON-COLLECTOR CONFIGURATION (CC)

The voltage at which the sudden increase in current occurs is called the __________

The life expectancy of the LED is very long, over _______ hours of operation.

Transistors are semiconductor devices with _______ or more terminals.

A second type of field-effect transistor has been introduced in recent years that has some advantages over the JFET. This device is the ___________________.

metal oxide semiconductor field effect transistor (MOSFET)