Abstract: An analog-to-digital converter includes a coarse conversion circuit, a fine conversion circuit, a scaling circuit, and a logic circuit. An analog input signal is applied to the scaling circuit which provides a scaled signal. The scaled signal is applied to the fine conversion circuit which provides a digital control signal. The digital control signal is applied to the coarse conversion circuit for initializing the coarse conversion circuit. Thereafter, the analog input signal is applied to the initialized coarse conversion circuit which provides a first digital code and a reference signal associated with the first digital code. A remainder signal is determined at least in part by the difference between the analog input signal and the reference signal. The remainder signal is applied to the fine conversion circuit which provides a second digital code. The logic circuit determines a digital output signal, representing the analog input signal, in response to at least the first and second digital codes.

Abstract: An analog-to-digital converter includes first current sources, second current sources, current regulators, and conductive channels, with each conductive channel coupled to a respective first current source, second current source, and current regulator. An analog input is split into the first current sources. Each second current source is associated with a unique reference current. At each channel where the first current source couples a larger current than the reference current, the current regulator couples a difference current to allow the second current source to couple the reference current. Alternatively, at each channel where the first current source couples a smaller current than the reference current, the current regulator does not couple a difference current, and the second current source couples the same current as the first current source.