MidPoint Biasing | Miscellaneous Bias Circuits

What is Midpoint Biasing? MidPoint Biasing : When an amplifier circuit is so designed that operating point Q lies at the centre of d.c. load line, the amplifier is said to be midpoint biased. When the amplifier is mid-point biased, the Q-point provides values of IC and VCE that are one-half of their maximum possible … Read more

Single Stage Transistor Amplifier | Phase Reversal

Introduction of Single Stage Transistor Amplifier it was discussed that a properly biased transistor raises the strength of a weak signal and thus acts as an amplifier. Almost all electronic equipment must include means for amplifying electrical signals. For instance, radio receivers amplify very weak signals—sometimes a few millionths of a volt at antenna–until they … Read more

What is Load Line Analysis | Voltage Gain

What Is Load Line? The output characteristics are determined experimentally and indicate the relation between VCE and IC. However, the same information can be obtained in a much simpler way by representing the mathematical relation between IC and VCE graphically. As discussed before, the relationship between VCE and IC is linear so that it can … Read more

Swamped Amplifier | Gain and Transistor Configurations

What is Swamped Amplifier? A swamped amplifier has a resistance tied to the emitter of the NPN transistor. Swamping the amplifier decreases the voltage gain. When an amplifier is swamped the voltage gain to the output is less dependent on the load. This helps to balance the output and protect the circuit when different loads … Read more

Multistage Transistor Amplifier | Frequency response.

Introduction:- Multistage Transistor Amplifier The output from a single stage amplifier is usually insufficient to drive an output device. Inther words, the gain of a single amplifier is inadequate for practical purposes. Consequently, additional amplification over two or three stages is necessary. To achieve this, the output of each amplifier stage is coupled in some … Read more

RC Coupled | Transformer Coupled | Direct Coupled Amplifier

What Is RC Coupled Amplifier? This is the most popular type of coupling because it is cheap and provides excellent audio fidelity over a wide range of frequency. It is usually employed for voltage amplification. Fig. 11.9 shows two stages of an RC coupled amplifier. A coupling capacitor CC is used to connect the output … Read more