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| Voltage Limiter Circuit Using Op-amp Posted: 10 Jun 2011 09:13 AM PDT An op-amp is usually used as a comparator in cases where its speed and accuracy are not critical. As illustrated in the earlier post (OP-AMP COMPARATOR), the switching speed of the op-amp comparator can be improved and noise can also be eliminated. The offset problems can also be reduced by adding a voltage compensating network and a offset reducing resistor. Since the op-amp is originally designed to act as an amplifier, its output will not act linearly with logic families like TTL. A TTL requires input voltages which range between (0-5) volts. Thus, to keep the op-amp's output voltage swing between these ranges, other components like zener diodes are added onto the circuit. Such circuits with specified output swing are called voltage limiters. Some of the most commonly used voltage limiter circuits are shown below. In the figure shown below, there are two zener diodes that are connected in the feedback path of the op-amp circuit. This design helps in keeping the voltage limit between the positive and negative values of the output voltage, V0. As shown in the waveform, as the voltage Vin increases from 0 to positive voltage, the value of V0 increases in the opposite direction (negative).... |
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