comparator
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- Analog comparator integrated circuits
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~17 min read
Article
21 sectionsContents
- Differential voltage
- Op-amp voltage comparator
- Design
- Open collector output
- Key specifications
- Speed and power
- Hysteresis
- Output type
- Internal reference
- Continuous versus clocked
- Applications
- Null detectors
- Zero-crossing detectors
- Relaxation oscillator
- Level shifter
- Analog-to-digital converters
- Window detectors
- Absolute-value detectors
- See also
- References
- External links
thumb|LM393 dual comparator, a common comparator integrated circuit chip, shown on a circuit board
In electronics, a comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. It has two analog input terminals V_+ and V_- and one binary digital output V_\text{o}. The output is ideally V_\text{o} = \begin{cases} 1, & \text{if }V_+ > V_-, \\ 0, & \text{if }V_+ A comparator consists of a specialized high-gain differential amplifier. They are commonly used in devices that measure and digitize analog signals, such as analog-to-digital converters (ADCs), as well as relaxation oscillators.