AM2NK www. AM2N www. AM2NDW www. AM2NW www. Applications 1.
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To achieve this the following stages were employed in the amplifier: 1. Gain Stage: The gain stage uses a potential divider biased mosfet amplifier circuit. The potential divider biased circuit is shown in figure 1. It simply amplifies the input signal and produces gain according to the equation 1.
The stages are isolated from each other with the help of interconnected capacitors that is RC coupling. Power Stage: A push pull amplifier is an amplifier which has an output stage that can drive a current in either direction through through the load. The output stage of a typical push pull amplifier consists of two identical BJTs or MOSFETs one sourcing current through the load while the other one sinking the current from the load.
Push pull amplifiers are superior over single ended amplifiers using a single transistor at the output for driving the load in terms of distortion and performance. A single ended amplifier, how well it may be designed will surely introduce some distortion due to the non-linearity of its dynamic transfer characteristics. Push pull amplifiers are commonly used in situations where low distortion, high efficiency and high output power are required.
Generally this splitting is done using an input coupling transformer. The input coupling transformer is so arranged that one signal in applied to the input of one transistor and the other signal is applied to the input of the other transistor.
A power gain stage was cascaded as the final stage of audio amplifier circuit. An extensive and in-depth experimental investigation has been performed the role of various capacitors in small-signal MOSFET amplifier circuit. Particular emphasis has been given to addressing basic issues involving capacitances in MOSFET amplifiers, rather than modifying the design.
The study uncovers several important new features of the amplifiers. It indicates that in the design of small-signal MOS amplifiers, it should never be taken for granted that coupling and bypass capacitors act as short circuit and have no effect on the ac input and output voltages. In fact, they contribute to the voltage levels seen at both the input and the output port of the amplifier.
When chosen judiciously for coupling and bypass operations they dictate the actual voltage gain of the amplifier at various frequencies of input signal. The lower cut-off frequencies are governed by the values of coupling and bypass capacitors whereas the upper cut-off is a result of shunt capacitance.
This shunt capacitance is the stray capacitance present between the junctions of the transistor. The capacitance is given by the formula. Figures: Figure.
2N7001 MOSFET. Datasheet pdf. Equivalent
MOSFET AUDIO AMPLIFIER(Low Noise and High Gain)
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