2012年2月24日 · H parameters (hybrid parameters) use Z parameters, Y parameters, voltage ratios, and current ratios to show the relationship between voltage and current in a two port network. They are useful for describing input-output characteristics, especially when Z or Y parameters are hard to measure, like in transistor s.

In the above equations, the hs are fixed for a given circuit and are called the Hybrid Parameters of Transistor or h parameters. Because these four parameters have mixed dimensions (h 11 has dimension of ohm, h 12 and h 21 are dimensionless, and h 22 has dimension of mho or siemen) so they are called Hybrid Parameters of Transistor or h parameters.

H Parameters, or Hybrid Parameters, are a set of four parameters used to describe the behaviour of a two-port network. They establish the relationship between the input and output voltages and currents in terms of both current and voltage.

We then describe the coupling network in terms of four hybrid parameters (h-parameters). We determine these parameters using the same measurement techniques as for z-parameters and y-parameters.

24.1 Hybrid Parameters Every *linear circuit having input and output terminals can be analysed by four parameters (one measured in ohm, one in mho and two dimensionless) called hybrid or h Parameters. Hybrid means “mixed”. Since these parameters have mixed dimensions, they are called hybrid parameters. Consider a linear circuit shown in Fig ...

h Parameters of Two Port Network are also called hybrid parameters. These parameters are very useful in constructing models for transistors. The transistor parameters cannot be calculated using by either short circuit admittance parameter or open circuit impedance parameter measurement.

There are 3 sets of the 4 hybrid parameters. One for each type of amp: common emitter, common base, common collector In order to differentiate one set of parameters from another the following notation is used:

The $ \mathbf{h} $ terms are known as the hybrid parameters (or, simply, $ h $ parameters) because they are a hybrid combination of ratios. They are very useful for describing electronic devices such as transistors; it is much easier to measure experimentally the $ h $ parameters of such devices than to measure their $ z $ or $ y $ parameters.

transistor hybrid parameters (h-parameters); for example dV, -1 = slope of input characteristic with v2 constant, d/1 is denoted by hi> and stated in ohms. d.l --2 = slope of forward current transfer characteristic with d/1 v2 constant, and is denoted by hr. V

Exercise 1 : Find h and g parameter. Example 1 : Apply Tellegen’s theorem and find out what will be relation between h12 and h21 of a reciprocal network. g21(s). Transmission Parameter. I2. Therefore, The T parameters of cascaded networks can be obtained by multiplying the T-matrices of the individual networks.