公开(公告)号：US07535398B2

公开(公告)日：2009-05-19

申请号：US11872850

申请日：2007-10-16

申请人： Seung-Hyun Lim ,  Jeong-Hwan Lee ,  Gun-Hee Han ,  Seog-Hoon Ham

发明人： Seung-Hyun Lim ,  Jeong-Hwan Lee ,  Gun-Hee Han ,  Seog-Hoon Ham

IPC分类号： H03M1/12

CPC分类号： H03M1/1245 ,  H03M1/403 ,  H04N5/3575

摘要： An analog-to-digital converter (ADC) includes first and second circuits, a differential amplifier, a comparator and a digital-to-analog converter (DAC). The first circuit samples a reset voltage, amplifies the sampled reset voltage, and subtracts a first reference voltage from the amplified reset voltage to produce a first difference. The second circuit samples a signal voltage, amplifies the sampled signal voltage, and subtracts a second reference voltage from the amplified signal voltage to produce a second difference. The differential amplifier produces a third difference based a comparison of the first and second differences from the first and second circuits. The comparator compares an output of the differential amplifier with at least one predetermined comparison voltage and outputs a comparison result as a digital value. The DAC is connected to the first and second circuits and the comparator, and controls the first and second reference voltages in response to the digital value.

摘要翻译： 模数转换器（ADC）包括第一和第二电路，差分放大器，比较器和数模转换器（DAC）。 第一电路对复位电压进行采样，放大采样的复位电压，并从放大的复位电压中减去第一个参考电压以产生第一个差值。 第二电路对信号电压进行采样，放大采样信号电压，并从放大的信号电压中减去第二参考电压以产生第二差值。 基于与第一和第二电路的第一和第二差异的比较，差分放大器产生第三差。 比较器将差分放大器的输出与至少一个预定的比较电压进行比较，并将比较结果作为数字值输出。 DAC连接到第一和第二电路和比较器，并且响应于数字值来控制第一和第二参考电压。