Abstract:
PURPOSE: A successive approximation register circuit and a successive approximation analog digital convertor including the same are provided to improve performance by reducing time which is taken to convert an analog signal into a digital signal. CONSTITUTION: A selecting unit(610) selects for a setting value of a first half period having the several times of scan periods. The selecting unit selects a reference value which is inputted at the scan period in a latter half period one by one. A register unit(620) includes a plurality of registers. A controlling unit(630) successively activates a register of the register unit at each scan period. The register activated among a plurality of registers(621,622,626) stores an output value of the selecting unit.
Abstract:
PURPOSE: A time-interleaved analog-to-digital converter is provided to have a small number of resistors, thereby effectively reducing the size of a circuit. CONSTITUTION: A first analog-digital converter(310) includes a sampling unit(301), a comparison unit(303), and a successive approximation register(305). The successive approximate register performs successive approximation of the output signals of the comparison unit. The comparison unit compares the sampled signal with a first reference voltage outputted from a reference voltage generator(340). The reference voltage generator comprises a reference voltage generating unit(343) and a controller(341). The controller provides a generated reference voltage to a plurality of analog to digital converters.