Function generator


Posted on Feb 6, 2014

A device used to generate different types of electrical waveforms over a wide range of frequencies is called function generator. The most common wave forms are square, sawtooth, triangular or sine wave shapes (drawn from top to bottom). The drawing shows an integrator circuit. There is a negative feedback provided by the capacitor, hence the poten


Function generator
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tial at the inverting and the non inverting input is held equal by the operational amplifier. The non inverting input is connected to ground, while the inverting input is connected to the input clamp of the circuit through R1. If the input clamp is connected to ground, the difference in potential between the inverting and the non inverting input is zero volts, hence the resulting output voltage of the operational amplifier is zero volts, too. Both plates of the capacitor are at the same potential. Furthermore both sides of the resistor are at the same potential, hence no current is running through the device and the state of the circuit is stable. If the input clamp of the circuit is connected to the positive supply voltage, the capacitor gets charged via R1, hence the potential at the inverting input would increase, but caused by the negative feedback, the voltage at the output clamp of the operational amplifier is decreasing in such a way, that the potential at the inverting input is kept at those of the non-inverting input, which it the ground level. While the left side of R1 is connected to the positive supply voltage and the right side of R1 is kept on ground by the operational amplifier, the voltage drop across the device and so the current through R1 and C1 is constant. There is a linear correlation between the voltage across the capacitor and the time passing by. Remember that the current and the capacitance are...




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