Draw the block diagram of function generator and explain its working.

Draw the block diagram of function generator and explain its working.
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Principle of operation of function generator: Function generator operates to produce different waveforms such as sine, square, triangular of adjustable frequency which is used to test functionality of various electronic circuits.This has capability of phase lock with other function generator or to a frequency standard and its output waveforms will have same accuracy and stability as standard source. In operation, frequency is controlled by varying the magnitude of current which drives the integrator. The frequency controlled voltage regulates two current sources the upper current source supplies constant current to the integrator whose output voltage increases linearly with time. Voltage comparator multivibrator changes states at a predetermined maximum level of the integrator output voltage. This change cuts off the upper current supply and switch on lower current supply. The lower current source supplies a reverse current to integrator so that] its output decreases linearly with time. When output reaches predetermined minimum level, voltage comparator again change state and switch on the upper current source. The output of integrator is triangular waveform whose frequency is determined by the magnitude of current supplied by constant current sources.

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