Common source amplifier, Electrical Engineering

Common Source Amplifier

A common-source amplifier is one of three basic single-stage field-effect transistor abbreviated as FET amplifier topologies, commonly used as a voltage or trans conductance amplifier, in electronics. The very easy way to tell if a FET is common source, common drain, or common gate is to examine in which the signal enters and leaves. The remaining terminal is what is termed as "common". In this instance, the signal enters the gate, and exits the drain. The just only terminal remaining is the source. This type of FET is a common-source FET circuit. The analogous bipolar junction transistor circuit is the common-emitter amplifier.

The common-source (CS) amplifier might be viewed like a transconductance amplifier or as a voltage amplifier. Since a transconductance amplifier, the input voltage is seen like modulating the current going to the load. Like a voltage amplifier, input voltage modulates the amount of current flowing via the FET, changing the voltage across the output resistance as per to Ohm's law. Though, the FET device's output resistance typically is not sufficiently high for a reasonable transconductance amplifier (preferably infinite), nor low enough for a decent voltage amplifier (preferably zero). Other main drawback is the limited high-frequency response of amplifier. Hence, in practice the output often is routed via either a voltage follower (common-drain or CD stage), or a current follower (common-gate or CG stage), to acquire much more favorable output and frequency characteristics. The CS-CG combination is termed as a cascode amplifier.

Posted Date: 1/11/2013 1:49:36 AM | Location : United States







Related Discussions:- Common source amplifier, Assignment Help, Ask Question on Common source amplifier, Get Answer, Expert's Help, Common source amplifier Discussions

Write discussion on Common source amplifier
Your posts are moderated
Related Questions
I have a project due tomorrow, i have exhuasted all my resources, and cannot understand how to do the project, it is VHDL coding in Quartus program, i can send the assignment if yo

Q. Illustrates typical thermal noise waveform? In general, any physical resistor or lossy device can be modeled by a noise source in series with a noiseless resistor, as shown

Explain in brief the functions of the clock generator chip, 8284. 8284 Clock generator: The 8284 is an ancillary element to the microprocessors. Without any clock generato

Execution Unit receives program instruction codes and data from BIU, implements these instructions and store the result in general registers.

Q. Define amplification factor, drain resistance and transconductance and derive the relationship between drain resistance and trans conductance? Drain resistance It is the

Establish the relationship between duty ratio and output voltage



Q. Illustrate the principles of operation of centralized SPC and distributed SPC and compare their performance. Ans: In centralized control, all control equipment is replac

Q. How many 500-page books can be stored on a 2400-ft, 1600-BPI magnetic tape if a typewritten page contains about 2500 bytes?