公开(公告)号：US20140176359A1

公开(公告)日：2014-06-26

申请号：US13722388

申请日：2012-12-20

Applicant: BROADCOM CORPORATION

Inventor： Jason Hu ,  Xinyu Yu ,  Jing Yang ,  Sumant Ranganathan

IPC: H03M1/12

CPC classification number: H03M1/0845

Abstract: An analog-to-digital converter (ADC) includes reference charge cancellation features to at least partially offset a voltage distortion on a bypass capacitor of a reference buffer due to a voltage reference hit taken by a switched capacitor bank with which the bypass capacitor is connected. The charge cancellation may be configured in logic to be input signal dependent because different resolved bits or transitions between resolved bits may cause different amounts of voltage reference hits. By adjusting the bypass capacitor in response to each of at least some of the reference hits while resolving a word of bits, the reference voltage signal provided by the bypass capacitor undergoes far less settling, remaining more stable and linear for a more accurate reference voltage. Furthermore, a smaller capacitor may be used for the bypass capacitor, reducing power consumption and area on chip.

Abstract translation: 模数转换器（ADC）包括参考电荷消除特征，以至少部分地偏移参考缓冲器的旁路电容器上的电压失真，这是由于旁路电容器连接的开关电容器组所引起的电压基准点 。 电荷消除可以被配置为逻辑以输入信号，因为解析的位之间的不同的分辨位或转换可能导致不同量的电压参考点。 通过在解析位字时响应于至少一些参考命中中的每一个来调节旁路电容器，由旁路电容器提供的参考电压信号经历较少的稳定，对于更准确的参考电压，保持更稳定和线性。 此外，旁路电容器可以使用较小的电容器，从而降低功耗和芯片上的面积。

公开(公告)号：US08749425B1

公开(公告)日：2014-06-10

申请号：US13722388

申请日：2012-12-20

Applicant: Broadcom Corporation

Inventor： Jason Hu ,  Xinyu Yu ,  Jing Yang ,  Sumant Ranganathan

IPC: H03M1/12

CPC classification number: H03M1/0845

Abstract: An analog-to-digital converter (ADC) includes reference charge cancellation features to at least partially offset a voltage distortion on a bypass capacitor of a reference buffer due to a voltage reference hit taken by a switched capacitor bank with which the bypass capacitor is connected. The charge cancellation may be configured in logic to be input signal dependent because different resolved bits or transitions between resolved bits may cause different amounts of voltage reference hits. By adjusting the bypass capacitor in response to each of at least some of the reference hits while resolving a word of bits, the reference voltage signal provided by the bypass capacitor undergoes far less settling, remaining more stable and linear for a more accurate reference voltage. Furthermore, a smaller capacitor may be used for the bypass capacitor, reducing power consumption and area on chip.

Abstract translation: 模数转换器（ADC）包括参考电荷消除特征，以至少部分地偏移参考缓冲器的旁路电容器上的电压失真，这是由于旁路电容器连接的开关电容器组所引起的电压基准点 。 电荷消除可以被配置为逻辑以输入信号，因为解析的位之间的不同的分辨位或转换可能导致不同量的电压参考点。 通过在解析位字时响应于至少一些参考命中中的每一个来调节旁路电容器，由旁路电容器提供的参考电压信号经历较少的稳定度，对于更精确的参考电压而言保持更稳定和线性。 此外，旁路电容器可以使用较小的电容器，从而降低功耗和芯片上的面积。