MULTI-BIT SUCCESSIVE APPROXIMATION ADC

摘要

PROBLEM TO BE SOLVED: To provide an analog/digital converter (ADC) which performs conversion into bits more than one per cycle, throughout several successive approximation cycles.;SOLUTION: A system comprises a capacitive sub DAC circuit 410 and an approximator 430. A switch S2 isolates the capacitive sub DAC circuit during one or more first cycles and merges the sub DAC circuit during one or more final cycles. A successive approximation register (SAR) 440 generates a digital output signal or a DAC digital signal. Furthermore, the system includes a DAC circuit and pre-charges an input capacitor Cin with at least either analog input signals or DAC analog signals. A programmable gain amplifier 420 amplifies an error signal, a multi-bit ADC converts the amplified error signal into a multi-bit digital signal, and the SAR uses the multi-bit digital signal to generate a DAC digital signal or a digital output signal.;COPYRIGHT: (C)2013,JPO&INPIT