# What is HFE and hie?

## What is HFE and hie?

hfe : It is called the current gain. hie : It is the internal resistance. hre : It is called reverse voltage gain. hoe : The reciprocal of it i.e. 1/hre is the output resistance.

## Why do we use H parameters for the small signal analysis of transistor BJT & why not Z or Y parameters?

H parameters are useful in describing the input-output characteristics of circuits where it is hard to measure Z or Y parameters (such as in a transistor). The problem can instead be solved by using hybrid parameters (i.e. h parameters).

How is Hie calculated?

Hie=rpi =beta*re or beta*26mv/IC (or IE) 26mv= VT at 27 C .

### What is H parameter?

H-parameters are one system for characterizing bipolar transistors. That means it is the ratio of output to input in the common emitter configuration, which in turn means it is the ratio of collector current to base current, which is basically the gain of a bipolar transistor.

### Why only H parameters are used for transistor?

Hope it helps!! H parameters i.e. hybrid parameters. These parameters are used to decide nature and behaviour of a circuit containing transistor/s (BJT or FET). The main limitation of h parameter is that it cannot depict the behaviour of the circuit at high frequency.

Where is Z parameter used?

Impedance parameters or Z-parameters (the elements of an impedance matrix or Z-matrix) are properties used in electrical engineering, electronic engineering, and communication systems engineering to describe the electrical behavior of linear electrical networks.

#### What is the unit of hoe or Hoc?

hoe is the conductance of the output. So 1/hoe is the resistance parallel to it. More the value of 1/hoe, better is the current source. So for a good transistor the value of hoe is very small.

#### What are h parameters in power electronics?

Hybrid Parameters or h Parameters. Hybrid parameters (also known as h parameters) are known as ‘hybrid’ parameters as they use Z parameters, Y parameters, voltage ratio, and current ratios to represent the relationship between voltage and current in a two port network.

What are h parameters (hybrid parameters)?

What are H Parameters (Hybrid Parameters?) Hybrid parameters (also known as h parameters) are known as ‘hybrid’ parameters as they use Z parameters, Y parameters, voltage ratio, and current ratios to represent the relationship between voltage and current in a two port network.

## What is the difference between z parameters and h-parameters?

So, in this case Z parameters are the desired parameters and h-parameters are the given parameters. Step 1 − We know that, the following set of two equations of two port network regarding Z parameters.

## How to represent h-parameters in terms of T parameters?

Here, we have to represent h-parameters in terms of T parameters. So, in this case hparameters are the desired parameters and T parameters are the given parameters. Step 1 − We know that, the following h-parameters of a two port network. Step 2 − We know that the following set of two equations of two port network regarding T parameters.