Agilent Technologies 4294A Manual do Utilizador descarregar pdf (Página 4)

4

There is no ideal inductor (L), capacitor

(C), or resistor (R). In reality, operat-

ing conditions such as signal level and

frequency determine the real-world

performance of a device based on

the electronic characteristics of the

device. An ideal component of high

quality could be considered to possess

a single, perfect circuit element over

some frequency range. However, in

reality, most components will reso-

nate as shown in these figures as the

frequency increases.

This is due to the fact that there are

both capacitive and inductive elements

present in real world components.

Component characteristics cannot be

expressed correctly with a two-element

model when the model contains only

one single reactive element. The

Agilent 4294A equivalent circuit

function enables modeling of the

impedance vs. frequency characteris-

tics with three or four elements. This

function helps you design quality

circuits and effective components.

Equivalent circuit analysis

The equivalent circuit function is used

to fit a circuit model to measured data,

or to simulate device performance

based on the value of each circuit

model element.

The 4294A has been programmed with

five equivalent circuit models to choose

from. This function automatically

extracts equivalent circuit parameters

from actual measurement data. The

characteristics of the device under test

(DUT) or the material under test (MUT)

can be analyzed with extracted model

element values.

NOTE: The simulation result and

the actual measurement data can be

displayed on the same screen.

Step 1.

After taking a measurement,

Step 2.

select an appropriate circuit model

Step 3.

and extract the circuit model parameters.

Step 4.

Then compare the simulation to the

actual measurement data. If the data

does not match, select a different

equivalent circuit model and try again.

Accurate, Real-World Characterization of Electronic Components

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