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

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

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

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

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

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

Voltage Divider Bias Method

What Is Voltage Divider Bias Method Voltage Divider Bias is the most widely used method of providing biasing and stabilization to a transistor. In this method, two resistances R1 and R2 are connected across the supply voltage VCC (See Fig. 9.24) and provide biasing. The emitter resistance RE provides stabilization. The name ‘‘voltage divider’’ comes … Read more

Emitter Bias | Circuits | Examples Of Emitter Bias

What is Emitter Bias Circuit Fig. 9.15 shows the emitter bias circuit. This circuit differs from base-bias circuit in two importantrespects. First, it uses two separate d.c. voltage sources ; one positive (+ VCC) and the other negative (– VEE). Normally, the two supply voltages will be equal. For example, if VCC = + 20V … Read more

Base Resistor Biasing | Methods of Transistor Biasing

What Are Methods Of Transistor Biasing? In the transistor amplifier circuits drawn so far biasing was done with the aid of a battery VBB which was separate from the battery VCC used in the output circuit. However, in the interest of simplicity and economy, it is desirable that transistor circuit should have a single source … Read more

Transistor Biasing | Faithful Amplification

Introduction Of Transistor Biasing The basic function of transistor is to do amplification. The weak signal is given to the base of thetransistor and amplified output is obtained in the collector circuit. One important requirement during amplification is that only the magnitude of the signal should increase and there should be no change in signal … Read more