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Encyclopedia > Common gate
Common gate amplifier
Common gate amplifier

A common-gate amplifier is one of the common configurations of FET electronic amplifier. It is normally used to convert low impedance to high impedance. Image File history File links Common gate amplifier. ... FET can mean: FET, field effect transistor FET, a Mazda piston engine This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... An electronic amplifier is a device for increasing the power of a signal. ... In electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. ...


Characteristics

Inherent voltage gain:

g_m (R_D | R_{load}),

Input resistance:

R_S left| {1 over g_m}right.

Current gain:

A_{vm} {r_{in} over R_{load}}

Output resistance:

R_D,

Transistor amplifiers


  Results from FactBites:
 
Circuit Design-Chapter 2 (937 words)
The common-gate amplifier is often used in high-frequency application and has a much larger bandwidth than the common source configuration.
The common gate amplifier has the highest output impedance of the three FET amplifier
The equivalent circuit model for differential and common modes are shown in Fig.
Common floating gate programmable link - Patent 4573144 (3561 words)
Control gates 22 and 17 are formed as part of a second layer of polysilicon and insulated from floating gate 23 by oxide.
Transistor 36 is analogous to transistor 11 of FIG.
With a high voltage applied to the control gate of transistor 37, electrons tunnel from the source and drain of transistor 37 to floating gate 41 which has the effect of increasing the threshold voltage of transistor 36 to a positive voltage.
  More results at FactBites »

 

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