Which of the following is NOT a characteristic of a Schmitt trigger?

A Schmitt trigger is a type of comparator circuit that incorporates hysteresis to provide a stable output even with noisy input signals. This characteristic allows it to switch between its high and low states without false triggering from minor fluctuations in input voltage. Hysteresis establishes two distinct threshold levels: one for transitioning from low to high and another for transitioning back from high to low, which effectively eliminates ambiguity in input signal transitions.

The design of a Schmitt trigger is optimized for high-speed operation, making it suitable in applications where quick response times are essential. Its purpose is to provide a clear and efficient way to handle signals that could be transitioning rapidly or could be affected by noise, hence enhancing circuit performance.

In contrast to these key features, a Schmitt trigger does not exhibit a linear response. Instead, it operates in a distinct on/off manner, responding to input signals at specific thresholds with defined state changes. This is foundational to its function and differentiates it from devices that provide a linear output relative to their input, which can often lead to ambiguity in the signal. Thus, a linear response is not a characteristic of a Schmitt trigger.