![]() ![]() The merit of this design is that the DC biasing of the amplifier is not dependent on the R E1 value, so the designer can set the R E1 value once the DC bias is fixed. In this configuration, the gain is controlled by keeping R C constant and varying R E1. In a common-emitter degeneration amplifier with a bypassed emitter resistor with a parallel resistor, the R E1 value is considerably smaller than R E, making the low impedance path for high-frequency signals through the bypass capacitor. Even though the gain of the amplifier is dependent on R C and R E1, designers usually keep R C constant and R E1 as a variable for gain control. ![]() This transistor amplifier design gives more importance to the R C and R E values, as the gain can be controlled using them.Ī common-emitter degeneration amplifier with a bypassed emitter resistor with series emitter resistor has a bypass capacitor that connects the resistor R E1 to the ground for high-frequency signals and bias stability. In common-emitter configurations without a bypass capacitor, the bias stability and gain of the amplifier depend on resistor R E. The gain of this amplifier is directly proportional to the resistor R C value. When this transistor amplifier is designed, the value of resistor R C is chosen to match the amplifier gain requirements. In a common-emitter without emitter degeneration, the bypass capacitor C B1 makes the ground connection of the emitter, so this configuration can also be called a grounded emitter. The emitter terminal remains common to base and collector. Irrespective of the configuration, an input signal is given to the base and output is collected from the collector terminal in all types of common-emitter amplifiers. Common-Emitter Transistor Amplifier Design Criteriaīefore discussing how to design a common-emitter transistor amplifier, it is important to understand the types of common-emitter amplifiers available. Let’s take a closer look at common-emitter transistor amplifiers and discuss some things designers should consider during the common-emitter transistor amplifier design process. Common-emitter configurations are the most widely used type of transistor amplifier, due to their high-efficiency and positive gain greater than unity. If the aim is to increase the amplitude of an AC signal, a common-emitter transistor circuit is designed. ![]() There are three configurations of transistor amplifiers: When amplifying AC signals using a transistor amplifier, both voltage and current can be amplified simultaneously. Transistor amplifiers are circuits that are used to amplify weak audio, DC, or AC signals, and have a wide range of applications. The merit of a common-emitter degeneration amplifier with a bypassed emitter resistor with a parallel resistor design is that the DC biasing of the amplifier is not dependent on the RE1 value, so the designer can set the RE1 value once the DC bias is fixed.Īmplifiers are critical to electronic circuits The gain of this amplifier is directly proportional to the resistor RC value. When a common-emitter transistor amplifier without emitter degeneration is designed, the value of resistor RC is chosen to match the amplifier gain requirements. Due to its high efficiency and positive gain greater than unity, the most commonly used transistor amplifier is the common-emitter transistor amplifier. ![]()
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