ANALOGUE-DIGITAL CONVERTER AND CHIP OF NON-BINARY CAPACITOR ARRAY WITH REDUNDANT BIT

摘要

An analogue-digital converter and a chip of a non-binary capacitor array with a redundant bit, wherein the non-binary capacitor array with the redundant bit comprises a common-mode voltage end, an analogue signal input end, at least one redundant capacitor and a plurality of capacitors; each capacitor is arranged between the common-mode voltage end and the analogue signal input end in parallel; all the capacitors arranged between the common-mode voltage end and the analogue signal input end are sequentially labelled from the highest order to the lowest order/the lowest order to the highest order, the sum of the corresponding capacitance values of the lowest-order capacitor and an any-order capacitor must be greater than or equal to the corresponding capacitance value of a higher-order capacitor adjacent to the any-order capacitor; and the ratio of the capacitance value of each capacitor to that of a unit capacitor is set to be a positive integer. In addition, the capacitor array is also applied to an analogue-digital converter or is made into a corresponding chip, so that a more flexible layout mode can be adopted during a later chip circuit layout design, and the difficulty in design is reduced.