OP amp [IV]

Summary: Application of integrated op amp, voltage comparator,

1. Voltage Comparator

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• Usually at one input of op amp plus reference voltage ur as the benchmark, while the other end adds the signal UI to be compared;
• The op amp has a large open-loop voltage magnification in the open-loop state, so when used as a comparator, it works in a saturated region, or non-linear region.

1) Classification: single-Limit comparator, hysteresis comparator, window comparator.

• Single comparator with a threshold value; hysteresis Comparator and window comparator

have two threshold values. There have been 0 comparators, general single-Limit comparators

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Note in the general single-limit comparator:

The threshold value in the formula is determined by the organization of the reference voltage and resistance.

• Hysteresis comparator in a single comparator, the input voltage threshold voltage near the small change, will cause the output voltage jump, anti-interference is poor.

The hysteretic characteristics of hysteresis comparator change the disadvantage of single limit.

• Window comparators

Note: The Urh and URLs are the comparator's two threshold voltages, respectively.

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Summary: The voltage transmission characteristics of the three elements are: the output voltage high and low level, threshold voltage and output voltage transition direction.

"Line and" of the voltage comparator. It means that only when the output of comparator 1 and 2 is high, the UO high level, otherwise the logic relationship is low.

OP amp [IV]