Function Generator Block Diagram and Working Principle


Hey, in this article, I am going to explain Function Generator Block Diagram. Here you can easily understand the working principle of a function generator from this Block Diagram of Function Generator. First of all, let's know what is a function generator? The function generator is an electronic device or circuit used to generate electronic signals with different waveforms and different frequencies. A function generator can generate a sine wave, triangular wave, square wave electronic signals. Also, a function generator can generate electronic signals from a few hertz to megahertz frequencies. A function generator also provides the facility to vary the frequency and shape of the waveforms as per our requirements.


Function Generator Block Diagram


Carefully see the block diagram of a function generator given below. You can easily understand the working of the function generator.

Function Generator Block Diagram, Block Diagram of Function Generator



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Function Generator Working Principle


The above diagram describes a three output function generator - Square Wave, Triangular Wave, and Sine Wave

Let's discuss each block of the circuit

Frequency Control Knob


Using this frequency control knob we can adjust the frequency of the output waveforms as per our requirements. It basically nothing but a potentiometer. Its main function to vary the voltage to regulate the current source 1 and 2.

Frequency Controlled Circuit


It consisting of resistors and capacitors. As per the charging and discharging rates of the capacitor, it regulates the two current sources(1 and 2). 


Current Source 1 and 2


These are the constant current sources input to the signal integrator. Among these two current sources, source 1 provides a forward current supply, and source 2 provides a reverse current supply to the integrator. So using the current source 1 the signal integrator can create the positive half cycle of the waveform and using the current source 2 the signal integrator can create the negative half cycle of the waveform.

Signal Integrator


Mainly the signal integrator is a current to voltage converter circuit. In normal, it takes the current from source 1 and generates a triangular waveform. The frequency of the triangular waveform depends upon the current supplied by the constant current supply sources.


Voltage Comparator


The main function of the voltage comparator multivibrator is to control the magnitude or voltage level of the waveform. When the magnitude or voltage of the waveform reaches the maximum predetermined level in the positive half cycle, the voltage comparator switches the current sources means it cut off source 1. Again when the voltage level reaches the maximum predetermined level in the negative half cycle, the voltage comparator switches the current source into source 1.

So, as the voltage comparator can control both the positive and negative half cycle of the waveform very precisely, it can generate the square wave electronic signal.


Resistance Diode Shaping Circuit


It takes the triangular wave signal from the signal integrator as an input and generates the sine wave signal. This Resistance diode shaping network changes the slope of the triangular wave. So the amplitude continuously changes with time and produces a sinusoidal wave having less than 1% distortion.


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Function Generator Block Diagram and Working Principle Function Generator Block Diagram and Working Principle Reviewed by Author on 2/15/2021 Rating: 5
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