公开(公告)号：US06611163B1

公开(公告)日：2003-08-26

申请号：US10102291

申请日：2002-03-20

Applicant: Subhashish Mukherjee ,  Sourja Ray ,  Sumeet Mathur

Inventor： Subhashish Mukherjee ,  Sourja Ray ,  Sumeet Mathur

IPC: G06G764

CPC classification number: H03F3/45977 ,  G01R19/0023 ,  H03F3/005 ,  H03K5/2481 ,  H03K5/249

Abstract: An offset compensated comparator 70 has capacitors 80 and 81 coupled directly between the inputs of a preamplifier 78 and the outputs of a previous stage amplifier 62. The comparator 70 also includes additional capacitors 82 and 83 coupled between the inputs of the preamplifier 78 and reference voltage nodes VREFP and VREFM. Switches 73 and 74 are coupled between the additional capacitors 82 and 83 and the reference voltage nodes VREFP and VREFM. An additional switch 72 is coupled between the additional capacitors 82 and 83. In this configuration, there are no series sampling switches between the previous stage amplifier 62 and the comparator 70. Eliminating the series switches reduces the load seen by the previous stage amplifier 62, which allows the previous stage amplifier 62 to have a faster settling time. This allows the current in the previous stage amplifier 62 to be decreased which reduces the power consumption.

Abstract translation: 偏移补偿比较器70具有直接耦合在前置放大器78的输入端和前一级放大器62的输出之间的电容器80和81.比较器70还包括耦合在前置放大器78的输入端和参考电压之间的附加电容器82和83 节点VREFP和VREFM。 开关73和74耦合在附加电容器82和83与参考电压节点VREFP和VREFM之间。 附加开关72耦合在附加电容器82和83之间。在该配置中，在前级放大器62和比较器70之间不存在串联采样开关。消除串联开关减小了前级放大器62所看到的负载， 这允许前级放大器62具有更快的建立时间。 这允许降低前级放大器62中的电流，从而降低功耗。