The input impedance of a current shunt feedback amplifier is the open loop impedance of the amplifier divided by 1+(A*beta)
FET s have very high input impedance when compared with Bipolar transistors.
The Junction Field Effect Transistor (JFET)exhibits characteristics which often make it more suited to a particular application than the bipolar transistor. Some of these applications are: - High Input Impedance Amplifier - Low-Noise Amplifier - Differential Amplifier - Constant Current Source - Analogue Switch or Gate - Voltage Controlled Resistor
Output of the power amplifier is smaller 0.1 ohms and input of the loudspeaker is more than 4 ohms.
Differential amplifier ANSWER: A differential amplifier is an op amp. If any amplification is required a preamplifier is used mainly to cut the white noise and improve the input impedance
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.
The input impedance of a current shunt feedback amplifier is the open loop impedance of the amplifier divided by 1+(A*beta)
In audio the input impedance of an amplifier is between 10 kiloohms and 20 kiloohms.
FET s have very high input impedance when compared with Bipolar transistors.
FET has very high input impedanceBJT has very low input impedance
no. input impedance is low & output impedance is high
MOSFET has high input impedance and offer input signal isolation from the circuit
A FET (Field Effect Transistor) is mainly used when the input signal needs to be isolated from the output. A FET has a very high input resistance, so very little current is required from the input. Voltage gain is not the main objective when using a FET.
The Junction Field Effect Transistor (JFET)exhibits characteristics which often make it more suited to a particular application than the bipolar transistor. Some of these applications are: - High Input Impedance Amplifier - Low-Noise Amplifier - Differential Amplifier - Constant Current Source - Analogue Switch or Gate - Voltage Controlled Resistor
low input impedance
A circuit (an amplifier) typically has a high input impedance so that it does not unduly load the input circuit. Any such load could cause distortion, and that is generally not desired.
main volage