Transistor amplifier lab report8/10/2023 ![]() ![]() As the base current increases, the collector current increases as a factor of β multiplied by the base current. The input voltage is applied to the base and the output voltage is taken from the collector most often these voltages are measured with respect to a ground, or zero volt, reference. The CE amplifier is generally used as a voltage amplifier, and the phase of its output voltage is inverted with respect to that of its input voltage. Reference to the schematic in the Procedure section of the lab will be helpful when reading the remainder of this section. We investigate the CE configuration in this lab, which is capable of voltage and current amplification, and is likely the most widely-used Class A amplifier configuration. Other classes include amplifiers with conduction angles less than 360 degrees, amplifiers that use pulsed digital signals followed by lowpass filters, and amplifiers with power supply voltages that track the signal being amplified in order to maximize efficiency. The three commonly-used Class A bipolar transistor configurations are the common-emitter (CE), emitter-follower (EF) (sometimes called common-collector, CC), and common-base (CB) amplifiers. We will delve further into the efficiency of Class A amplifiers in the Theory section. This type of operation produces relatively low distortion, mostly limited to the distortion of the transistor itself, but is also low on efficiency since the transistor dissipates considerable DC power even when there is no input signal present. In Class A amplifiers, the transistor is operational over the full sine wave cycle, so its conduction angle is 360 degrees. This angle is called the conduction angle. Initial amplifier configurations were divided into classes based upon the angle of a sine wave being amplified in which the transistor was operational. In this lab we build and evaluate a Class A amplifier using a NPN transistor and a few passive elements. The basic operation of the NPN transistor was introduced in the “Introduction to Transistors” lab. ![]()
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