FET AS A VOLTAGE -VARIABLE RESISTOR (VVR):
FET is operated in the constant current portion of its output characteristics for the linear applications .In the region before pinch off , where Vds is small the drain to source resistance rd can be controlled by the bias voltage Vgs.The FET is useful as a voltage variable resistor (VVR) or Voltage Dependent resistor.
In JFET the drain source conductance gd = Id/Vds for small values of Vds which may be expressed as gd = gdo [ 1-( VgsVp)1/2 ] where gdo is the value of drain conductance when the bias voltage Vgs is zero.
The variation of the rd with vgs can be closely approximated by rd = ro / 1- KVgs ro - drain resistance at zero gate bias and K constant dependent upon FET type.
Small signal FET drain resistance rd varies with applied gate voltage Vgs and FET act like a VARIABLE PASSIVE RESISTOR.
Advantagesof JFET
Very high input impedance order of 100 ohm
Operation of JFET depends on the bulk material current carriers that do not cross junctions
Negative temperature coefficients
Very high power gain
Smaller size longer life and high efficiency
Ac drain resistance rd it is the ratio of change in drain - source voltage to the change in drain current at constant gate source voltage
Transconductance it is the ratio of change in drain current to the change in gate source voltageat constant drain source voltage
Amplification factor it is the ratio of change in drain source voltage to the change in gate source voltage at constant drain current.
B=sillicon f=fet w=used in high frequency application 11=gain of transistor
FET is a field effect transistor, abbreviated to FET. There are two basic types of FET: a junction FET abbreviated to JFET and an insulated gate FET , abbreviated to IGFET. The most common type of IGFET is a metal-oxide silicon FET, Known as a MOSFET. Modern microprocessors may contain tens of millions of MOSFETs.
FET stands for field-effect transistor.
mobility decreases
fet is a voltage controlled device...cut off voltage in fet refers to that voltage of the gate - source junction at which the current flow through channel is zero
Invesco Senior Income Trust (VVR)had its IPO in 1998.
FET's improve the switching frequency from KHZ to MHZ.. FET can be used as temperature sensor.. and mosfet is used as a switch..
As of July 2014, the market cap for Invesco Senior Income Trust (VVR) is $892,979,353.60.
FET is an acronym that is used in a variety of situations including education, medical, business and electronics. The abbreviation FET stands for Field-effect Transistor.
explain all the parameters of fet
B=sillicon f=fet w=used in high frequency application 11=gain of transistor
amplifers fet ujt
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Fet's population is 9,485.
FET is a field effect transistor, abbreviated to FET. There are two basic types of FET: a junction FET abbreviated to JFET and an insulated gate FET , abbreviated to IGFET. The most common type of IGFET is a metal-oxide silicon FET, Known as a MOSFET. Modern microprocessors may contain tens of millions of MOSFETs.
A. A. Fet has written: 'Volshebnye zvuki'
FET stands for field-effect transistor.