![]() ![]() The capacitor charges up at a rate determined by the RC time constant, ( τ ) of the series RC network. As the impedance of the capacitor at this point is very low, the gain ratio of X C/R IN is also very small giving an overall voltage gain of less than one, ( voltage follower circuit ).Īs the feedback capacitor, C begins to charge up due to the influence of the input voltage, its impedance Xc slowly increase in proportion to its rate of charge. No current flows into the amplifiers input and point X is a virtual earth resulting in zero output. When a step voltage, Vin is firstly applied to the input of an integrating amplifier, the uncharged capacitor C has very little resistance and acts a bit like a short circuit allowing maximum current to flow via the input resistor, Rin as potential difference exists between the two plates. ![]() ![]() In other words the magnitude of the output signal is determined by the length of time a voltage is present at its input as the current through the feedback loop charges or discharges the capacitor as the required negative feedback occurs through the capacitor. As its name implies, the Op-amp Integrator is an operational amplifier circuit that performs the mathematical operation of Integration, that is we can cause the output to respond to changes in the input voltage over time as the op-amp integrator produces an output voltage which is proportional to the integral of the input voltage.
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