  Analog-to-digital converters (ADCs) facilitate the conversion of analog
signals into a digital format. While the specific designs and settings of ADCs
can vary depending on their applications, it is crucial in many modern
applications to minimize their power consumption. The significance of low-power
ADCs is particularly evident in fields like mobile and handheld devices reliant
on battery operation. Key parameters of the ADCs that dictate the ADC's power
are its sampling rate, dynamic range, and number of quantization bits.
Typically, these parameters are required to be higher than a threshold value
but can be reduced by using the structure of the signal and by leveraging
preprocessing and the system application needs. In this review, we discuss four
approaches relevant to a variety of applications.
