## What is the input impedance of BJT?

The input impedance of BJT is less than FET. The input impedance of FET is less than the input impedance of MOSFET. This is because FET uses reverse bias between gate and drain terminals that provide high input impedance. In the case of MOSFET, the high impedance Is provided by the oxide layer.

How do you calculate input impedance?

1: Input impedance is measured by adding a voltage signal at the input terminals of a power supply and measuring input voltage and input current perturbations. Figure 2 shows how this is implemented practically using a frequency response analyzer and a few discrete devices.

### What is the input impedance of a common-emitter amplifier?

around 1kΩ
Common emitter amplifier impedance levels One of the key attributes to be considered when undertaking any electronic circuit design are the impedance levels. The input impedance is typically around 1kΩ, although this can vary considerably according to the circuit values and conditions.

What is the input impedance of CE configuration?

So for the common base configuration the input impedance is very low and depending on the value of the source impedance, RS connected to emitter terminal, input impedance values can range from between 10Ω and 200Ω.

#### What is the input of BJT?

Hence, the input is between the base and the emitter while the output is between the collector and the emitter. Two terms that you must remember: Input characteristic – the variation of the base current (IB) with the base-emitter voltage (VBE)

What do you mean by input impedance?

The input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into the load network that is external to the electrical source.

## What is the input impedance of a multimeter?

The impedance of the meter varies depending on the basic sensitivity of the meter movement and the range which is selected. For example, a meter with a typical 20,000 ohms/volt sensitivity will have an input resistance of two million ohms on the 100 volt range (100 V * 20,000 ohms/volt = 2,000,000 ohms).

How do you calculate input and output impedance?

The Output Impedance of an amplifier can be thought of as being the impedance (or resistance) that the load sees “looking back” into the amplifier when the input is zero. Working on the same principle as we did for the input impedance, the generalised formula for the output impedance can be given as: ZOUT = VCE/IC.

### What is the input impedance of a circuit?

The input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into the load network that is external to the electrical source. The input admittance (1/impedance) is a measure of the load’s propensity to draw current.