公开(公告)号：US20030197636A1

公开(公告)日：2003-10-23

申请号：US10455894

申请日：2003-06-06

Applicant: STMicroelectronics S. r. l.

Inventor： Pierangelo Confalonieri ,  Marco Zamprogno ,  Angelo Nagari

IPC: H03M001/12

CPC classification number: H03M1/68 ,  H03M1/468 ,  H03M1/804

Abstract: A switched capacitor digital to analog converter includes first and second converter segments having respective first and second arrays of binary weighted capacitors. Each capacitor of the first segment has a first electrode connected to a first common node and a second electrode connected through respective switches to one of first and second reference voltage terminals. Each capacitor of the second segment has a first electrode connected to a second common node and a second electrode connected through respective switches to one of the first and second reference voltage terminals. The converter includes a coupling capacitor connected between the first and second common nodes and capacitance means connected between the first common node and a reference voltage terminal. The coupling capacitor and capacitance means have capacitances, Cs and CATT respectively, that substantially satisfy the relationship: (2pnull1)nullCsnullCATTnull2pnullC, where p is the number of bits coded in the first converter segment and C is the unit capacitance.

Abstract translation: 开关电容器数模转换器包括具有相应的第二和第二二进制加权电容器阵列的第一和第二转换器段。 第一段的每个电容器具有连接到第一公共节点的第一电极和通过各个开关连接到第一和第二参考电压端子之一的第二电极。 第二段的每个电容器具有连接到第二公共节点的第一电极和通过各个开关连接到第一和第二参考电压端子之一的第二电极。 该转换器包括连接在第一和第二公共节点之间的耦合电容器和连接在第一公共节点和参考电压端子之间的电容装置。 耦合电容器和电容装置分别具有电容Cs和CATT，其基本上满足以下关系：（2

-1）.C-CATT = 2·C，其中p是在 第一转换器段，C为单位电容。