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ADC-Architecture-Slide3

The comparator is a 1-bit ADC and is a fundamental building block in nearly all ADC architectures. It is important to understand a few comparator characteristics which can affect ADC performance. In vacuum tube circuits, the comparator was often called a "limiter" or "discriminator," but it still performed the basic function. Noise and hysteresis limit the comparator's ability to resolve the small differential input signal as it approaches zero. Most comparators used in ADCs have a built-in latch. In some cases, the comparator has relatively low gain in the non-latched (or "track") mode, and high regenerative gain when it is placed in the latched (or "hold") mode.

PTM Published on: 2007-10-05