0
What else can I help you with?
What are the main differences between FETs and BJTs in terms of input impedance?
FET has very high input impedanceBJT has very low input impedance
Could you briefly explain the applications of FET?
Due to its *low noise *high input impedence and low output impedence FET is used in numerous applications. *Buffer ampliier *Phase shift oscillator *Integrator *Amplifier
Compared to bipolars FETs have-a high input impedance b low input impedance c same input impedance?
FET s have very high input impedance when compared with Bipolar transistors.
Why FET is an excellent buffer amplifier?
FET is an excellent buffer amplifier because it has an high input impedance by which when we are connecting two networks for transferring out put of one stage to another stage all the power is drown on the second network not on first network.if first stage network has an low input impedance then first circuit drown all power from second circuit.
What gate the output will be low for any case when one or more input are zero?
An inverter has a high output when the input is low, and a low output when the input is high.
What is the range of input gate current of FET?
The input gate current of a Field-Effect Transistor (FET) is ideally zero because FETs are voltage-controlled devices with very high input impedance. In practice, the gate current may be in the range of picoamperes (pA) to nanoamperes (nA) due to leakage currents and other non-ideal behaviors. This exceedingly low current helps maintain the efficiency and performance of FETs in various applications.
Why electrolytic capacitors are used for frequency response of BJT as amplifier?
It can take a lot of capacitance to present a low impedance to a low frequency. Electrolytics offer lots of capacitance for a low price.
Why does a FET transistor has high input impedance and low output impedance?
A FET (Field-Effect Transistor) has high input impedance because it operates by controlling the current flow through an electric field rather than relying on a direct current path, which minimizes the input current. This is due to the gate being insulated from the channel by a thin layer of oxide, resulting in minimal charge flow into the gate. Conversely, FETs have low output impedance because they can drive loads effectively without significant voltage drop across the transistor, allowing for efficient power transfer. This combination makes FETs ideal for applications requiring high sensitivity and low power loss.
Why FEt is source follower?
A Field Effect Transistor (FET) operates as a source follower due to its configuration where the output is taken from the source terminal. In this setup, the input signal is applied to the gate, and the output voltage at the source closely follows the gate voltage, minus a small threshold voltage drop. This characteristic allows the source follower to provide a high input impedance and low output impedance, making it an effective buffer for signal amplification without significant gain.
What is the definition for Input low current?
Input Low Current, IIL, is the current that must be sinked (pulled from) an input in order to guarantee that the input is seen as low.
What is the difference between jfet and bjt?
FET's (field effect transistors) are unipolar devices because unlike BJT's that use both electron and hole current, they operate only with one type of charge carrier. BJT is a current-controlled device; that is the base current controls the amount of collector current. FET is a voltage-controlled device, where voltave between two of the terminals (gate and source) controls the current through the device. BJT's have a low input impedance ( ~1k -3k ohms), while FET's have a very high input impedance (~10^11 ohms). Consequently FET's have a lower power consumption. BJT's produce more noise than FET's . FET's have a slower switching speed . BJT's are subject to thermal runway while FET's are immune to this problem. BJT's have a higher cutoff frequencey and a higher maximum current then FET's. FET's are easy to fabricate in large scale and have higher element density the BJT's.
What is the effect of capacitance at high frequencies?
A: Is the same as low frequency except it becomes a predominant factor.
