A good amplifier circuit aims for a high, distortion-free voltage gain (Au) and a high input resistance (Ri), while the output resistance (Ro) should be as low as possible, and the bandwidth should be as wide as possible. The circuits introduced earlier are all BJT common emitter amplifier circuits, which can achieve a relatively high … Read more
The BJT amplifier circuit requires distortion-free amplification of small signals, with a larger voltage gain Au being preferable, a wider bandwidth being better, and a larger AC input resistance Ri being desirable, while a smaller AC output resistance is also preferable. In the Multisim workspace, place 1 DC power supply V1 (12V), 1 AC small … Read more
In the Multisim workspace, place two DC voltage sources V1 (5V) and V2 (15V), one AC small signal source V3 (effective value 0.1V, frequency 100Hz), one potentiometer R1 (1MΩ), one resistor R2 (5kΩ), one BJT Q1 (2N2221), two probes PR1 (to measure the base potential current of the BJT) and PR2 (to measure the collector … Read more
The bipolar junction transistor, also known as a transistor or BJT, is a core component in analog circuits. It can be classified into NPN and PNP types based on structure; silicon and germanium types based on material; low-frequency, high-frequency, and ultra-high-frequency types based on operating frequency; and small, medium, and large power types based on … Read more
The previous article introduced the PN junction and a typical transistor – the Bipolar Junction Transistor (BJT). Next, we will introduce another typical transistor – the Field Effect Transistor (FET). FET includes Junction Field Effect Transistor (JFET) and Metal-Oxide-Semiconductor Field-Effect Transistor (MOS FET, Metal-Oxide-Semiconductor Field-Effect Transistor, abbreviated as MOS). The specific classification of FET is … Read more