Multistage Amplifiers

Cascode Amplifier or CE-CB Configuration

Cascode Amplifier or CE-CB Configuration: The CE-CB configuration (usually referred to as cascode amplifier) is shown in Fig. 16.44. Figure 16.44 shows a cascode configuration with a common-emitter (CE) stage feeding a common-base (CB) stage. This configuration of course, has basically the input characteristics similar to those of CE amplifier and output characteristics similar to …

Cascode Amplifier or CE-CB Configuration Read More »

Direct Coupled Transistor Amplifier – Operations and Equivalent Circuit

Direct Coupled Transistor Amplifier – Operations and Equivalent Circuit: Direct coupling is essential for very low frequency (below 10 Hz) applications such as photoelectric current, thermocouple current etc. Thermocouples are used for measurement of temperature in furnaces. The voltage induced in the thermocouple is very small in magnitude (of the order of μV). This voltage …

Direct Coupled Transistor Amplifier – Operations and Equivalent Circuit Read More »

Impedance Coupled Transistor Amplifier

Impedance Coupled Transistor Amplifier: A two-stage impedance coupled transistor amplifier using N-P-N transistors in CE configuration is shown in Fig. 16.37. The only difference between this circuit and R-C coupled transistor amplifier circuit is that collector resistance RC of first transistor has been replaced by an inductor L. The inductor turns are wound on a …

Impedance Coupled Transistor Amplifier Read More »

Transformer Coupled Transistor Amplifier – Working Principle

Transformer Coupled Transistor Amplifier – Working Principle: The main cause for low voltage and power gains of an R-C coupled amplifier is that the effective load (Rac) of each stage is reduced due to the low impedance presented by the input of each stage to the preceding stage. This is because the input impedance of …

Transformer Coupled Transistor Amplifier – Working Principle Read More »

RC Coupled Transistor Amplifier – Operations, Derivation and Applications

RC Coupled Transistor Amplifier – Operations, Derivation and Applications: A two-stage RC Coupled Transistor Amplifier using N-P-N transistors in CE configuration is shown in Fig. 16.12. The two transistors used are identical and use a common power supply VCC. The resistors R1, R2 and RE form the biasing and stabilization network. In this arrangement, the signal …

RC Coupled Transistor Amplifier – Operations, Derivation and Applications Read More »

Scroll to Top