IC for IEBus with hysteresis comparator input. The analog equivalent of digital comparator is the voltage comparator. Schmitt triggers are commonly implemented using an operational amplifier or a dedicated comparator. The input signal and the DAC both go to a comparator. Figure 1 above shows a comparator circuit. Some op-amps have clamping diodes on the input that prevent use as a comparator. An important application of it is the comparator with hysteresis, the Schmitt trigger. That is, the op-amp is being used as a voltage comparator. The quantizer can be realized with a "N-level" comparator, thus the modulator has "logN"-bit output. This has the advantage that a slow comparator cannot be disturbed by fast input changes. An operational amplifier can, if necessary, be forced to act as a comparator. This code simulates the two D-type flip-flops that comprise a phase-frequency comparator. It is possible to compare negabinary numbers by slightly adjusting a normal unsigned binary comparator. The receivers are connected to a device referred to as a voting comparator or voter. Flash ADCs have drifts and uncertainties associated with the comparator levels results in poor linearity.