Class a amplifier operation, engineering, Other Engineering brings you unique solution in electrical engineering

Class A Amplifier Operation

Class A amplifiers are biased so that variations in input signal polarities occur within the limits of CUTOFF and SATURATION. In a PNP transistor, for example, if the base becomes positive with respect to the emitter, holes will be repelled at the PN junction and no current can flow in the collector circuit. This condition is known as cutoff. Saturation occurs when the base becomes so negative with respect to the emitter that changes in the signal are not reflected in collector-current flow.

Biasing an amplifier in this manner places the dc operating point between cutoff and saturation and allows collector current to flow during the complete cycle (360 degrees) of the input signal, thus providing an output which is a replica of the input. Figure 2-12 is an example of a class A amplifier. Although the output from this amplifier is 180 degrees out of phase with the input, the output current still flows for the complete duration of the input.

The class A operated amplifier is used as an audio- and radio-frequency amplifier in radio, radar, and sound systems, just to mention a few examples. 



Posted Date: 2/11/2012 10:45:35 PM | Location : United States

Related Discussions:- Class a amplifier operation, engineering, Assignment Help, Ask Question on Class a amplifier operation, engineering, Get Answer, Expert's Help, Class a amplifier operation, engineering Discussions

Write discussion on Class a amplifier operation, engineering
Your posts are moderated
Related Questions

What is the energy related CO 2 emissions per capita and per $1,000 of GDP? Add the point representing Florida on the Energy CO 2 intensity graph in Appendix. How does it

load flow analysis by fast decoupled method


The town of Smog, Idaho is located in a river valley and has a footprint of 6 km x 2 km. It has an average daily emission rate of 1000 kg/day of PM2.5 into the atmosphere from wood

why we use h for bjt

A second way to determine the shear modulus is to use the Isopescu shear test. The sample is placed in a jig and loaded as shown. Under load, a region of pure shear exists

Vibrating beam accelerometer The electrodes are driven by a high frequency voltage (1 MHz). The displacement is measured using a phase detector from the change of capacitance b

Operating System Assignment# Priority Scheduling leads to the risk of starvation: a process is ready, but never is given the processor. Some preemptive priority schedulers therefor