The function generator is a generating instrument. It is also called the sweep function generators. They produce non sinusoidal signals and asymmetrical signals. These signals can be mathematically described as a function of time. Therefore they are called function generators.
(b) Explanation of the Block Diagram and Working :
Triangular, ramp, square rectangular, and also sine wave voltages can be obtained from these function generators. They work in the frequency range from 0.001 Hz to around 20 MHz
The block diagram is given in Figure.
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| Block Diagram of a Function Generator |
(b) Explanation of the Block Diagram and Working :
Usually function generators derive their frequency from a non-sinusoidal oscillator. The block diagram shows a triangular wave generator as the signal source. The triangular wave is generated by charging a capacitor using two constant current sources. Electronic switching will be iced to connect the positive current source and negative current source to the capacitor for required eriods to generate a linear ramp signal. This triangular signal is amplified.
There are two shaper circuits that produce either the sine wave or square wave. A switch is used to select the required wave shape. The output from the shapers or direct from the source generator is given to the amplifier. If required, an off set voltage can be added to the wave from the off set generator. The attenuated output is available from the output socket. This function generator can give triangular, square and sine wave signals.
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Signal Generators