One function generator may be used to phase lock a second function generator, and the two output signals can be displaced in phase by an adjustable amount. By adjustment of the phase and the amplitude of the harmonics, almost any waveform may be produced by the summation of the fundamental frequency that is generated by one function generator and the harmonic generated by the other function generator. Hence, waveforms- triangular, square and sine is obtained.įunction Generator has a special capability of phase locking. The output circuit of the function generator consists of two output amplifiers that provide two simultaneous, individually selected outputs of any of the waveform function. The resistance diode network alters the slope of the triangular wave as its amplitude changes and produces a sine wave with less than 1% distortion. The comparator delivers a square wave voltage of the same frequency. Hence, triangular waveform is obtained at output. The lower current source supplies a reverse current to the integrator, so that its output decreases linearly with time. When output reaches a pre-determined minimum level on the negative slope of the output waveform the voltage comparator again changes states it switches on the upper current source and cuts off the lower current source. This change of state cuts of the upper current supply and switches on the lower current supply. As the output of integrator reaches at a pre-determined maximum level on the positive slope of the output waveform the voltage comparator changes state. According to the equation of the output signal voltage:Īn increase or decrease in the current increases or decreases the slope of the output voltage and hence controls the frequency. ![]() The upper current source supplies constant current to the integrator whose output voltage increases linearly with time. ![]() The frequency controlled voltage regulates two current sources shown in block diagram. This is a specialized signal generator in which the frequency is controlled by varying the magnitude of current which drives the integrator where in other common instruments, frequency is controlled by varying the capacitor in the LC or RC circuit. First models invented in the early 1950s when digital technology was not widely used. The capability of phase locking is a specialty of function generator.Īnalog function generator was the first type to be developed. the generation can provide a square wave to test the linearity of an amplifier and simultaneously provide a sawtooth to drive the horizontal deflection amplifier of the CRO to provide display. The various outputs of generator can be made available at the same time e. If the zero crossing of both the waves are made to occur at the same time, a linearly varying waveform is available which can be started at the point of zero phase of a sine wave. A triangular wave and a sine wave of equal frequencies can be produced simultaneously. By providing a square wave for linearity measurements in an audio-system, a simultaneous sawtooth output maybe used to drive the horizontal deflection amplifiers of an oscilloscope, providing visual display of the measurement result. They are also used in driving sweep oscillators in the X-axis of X-Y recorders oscilloscopes. The sawtooth wave and triangular-wave outputs of function generators are commonly used for those applications which need a signal that increases (or reduces) at a specific linear rate. It can be implemented with basic expensive components. ![]() It produces different types of waveforms such as sine, square, triangle and sawtooth over a wide range of frequencies. A wide variety of synthesized electrical signals and waveforms can be created for testing, repairing and diagnostic applications. INTRODUCTIONĪ function generator is a very versatile instrument that is used in electronics, mechanics, bioengineering, physics and many other fields. Shaheed Rajguru College of Applied Sciences for Women, University of Delhi. Project Investigators: Dr Sneha Kabra, Dr Amita Kapoor, Ms Himani Dua, ![]() Mridula Gupta, Department of Electronics, South campus. Development of e-resource on standard procedure of operation and applications of important Electronic devices used by undergraduate science students.
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