How do you find H parameters?
Table of Contents
How do you find H parameters?
The h parameters of a circuit shown in Fig. 1 can be found out as under: (i) If we short-circuit the output terminals (See Fig. 2), we can say that output voltage v2 = 0. Putting v2 = 0 in equations (i) and (ii), we get, v1 = h11 i1 + h12 × 0 i2 = h21 i1 + h22 × 0 ∴ h11 = v1/ i1 for v2 = 0 i.e.
What are H parameters of CE configuration?
The h-parameters of a transistor used in a common emitter circuit are hie = 1.0 KΩ, hre = 1.0 x 10-4, hfe = 50 and hoe = 100 µmhos. The load resistor for the transistor is 1KΩ in the collector circuit.
What is H parameter?
h – Parameters are real numbers up to radio frequencies. They are easy to measure. They can be determined from the transistor static characteristics curves. They are convenient to use in circuit analysis and design. Easily convert able from one configuration to other.
What are the 4 h parameters?
DETERMINATION OF H-PARAMETERS
| No. | Parameter | Meaning |
|---|---|---|
| 1 | h11 | Input resistance |
| 2 | h12 | Reverse voltage gain |
| 3 | h21 | Forward current gain |
| 4 | h22 | Output conductance |
Why h parameters are used?
The h parameters are used to analyzing Bipolar Junction Transistor or BJT. Whereas, g parameter are used to analyzing Junction Field Effect Transistor or JFET.
What is the unit of H parameter?
h-parameters are called as hybrid parameters. The parameters, h12 and h21, do not have any units, since those are dimension-less. The units of parameters, h11 and h22, are Ohm and Mho respectively.
What are the limitations of H parameters?
The main limitation of h parameter is that it cannot depict the behaviour of the circuit at high frequency. Not only h parameter, but also Z para., Y para, ABCD para, g parameters cannot depict the behaviour of the circuit at high frequency.
What are the benefits of h parameters?
Benefits of h-parameters
- Real numbers at audio frequencies.
- Easy to measure.
- Can be obtained from the transistor static characteristics curves.
- Convenient to use in circuit analysis and design.
- Most of the transistor manufacturers specify the h-parameters.
Why are H parameters called?
hr =Ratio of voltages ( each in volts) in no units. So, h parameter is a hybrid of different units. Hybrid means “mixed”. As we have 4 hybrid parameters all of them having different nature (i.e each represents a different parameter) we call them hybrid parameters.
Why h parameters are so called?
Hybrid means “mixed”. As we have 4 hybrid parameters all of them having different nature (i.e each represents a different parameter) we call them hybrid parameters. H12=reverse voltage gain.
What are benefits of H parameters?
What are the advantages of H parameters?
What are the salient features of H parameters?
Answer
- h-parameters are Real Numbers up to radio frequency.
- They are easy to measure.
- They can be determined from transistor static characteristic curves.
- They are convenient to use in circuit analysis and design.
- Easily convertible from one configuration to other.
- Readily supplied by manufacturers.
How many H parameters are there for a transistor?
One of the methods that takes into account all the effects in a transistor amplifier is the hybrid parameter approach. In this method, four parameters (one measured in ohm, one in mho, two dimen- sionless) of a transistor are measured experimentally. These are called hybrid or h parameters of the transistor.
