公开(公告)号：US20160048707A1

公开(公告)日：2016-02-18

申请号：US14826928

申请日：2015-08-14

Applicant: QUALCOMM Incorporated

Inventor： Dinesh Jagannath ALLADI ,  Yuhua GUO

IPC: G06G7/186 ,  H03M3/00

CPC classification number: G06G7/186 ,  G06G7/1865 ,  H03M3/32 ,  H03M3/342 ,  H03M3/344 ,  H03M3/496 ,  H03M3/50

Abstract: Certain aspects of the present disclosure provide various sampling networks for switched-capacitor integrators, which may be used in switched-capacitor analog-to-digital converters (ADCs). Rather than having both an input sampling capacitor and a reference sampling capacitor, certain aspects of the present disclosure use a shared sampling capacitor for the reference voltage and the input voltage, thereby reducing ADC input-referred noise, decreasing op amp area and power, and avoiding anti-aliasing filter insertion loss. Furthermore, by sampling the reference voltage during the sampling phase and sampling the input voltage during the integration phase using the shared sampling capacitor, a high-bandwidth reference buffer need not be used for the reference voltage.

Abstract translation: 本公开的某些方面提供用于开关电容器积分器的各种采样网络，其可用于开关电容器模数转换器（ADC）。 不同于输入采样电容器和参考采样电容器两者，本公开的某些方面使用共享采样电容器作为参考电压和输入电压，从而减少ADC输入参考噪声，降低运算放大器面积和功率，以及 避免抗混叠滤波器插入损耗。 此外，通过在采样阶段对参考电压进行采样并使用共享采样电容在积分阶段对输入电压进行采样，高参考电压不需要用于参考电压。