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    • 73. 发明授权
    • Cyclic A/D converter, image sensor device, and method for generating digital signal from analog signal
    • 循环A / D转换器,图像传感器装置以及从模拟信号产生数字信号的方法
    • US08581171B2
    • 2013-11-12
    • US13124319
    • 2009-10-15
    • Shoji KawahitoJong-ho ParkSatoshi AoyamaKeigo Isobe
    • Shoji KawahitoJong-ho ParkSatoshi AoyamaKeigo Isobe
    • H01L27/146
    • H03M1/0695H03M1/123H03M1/403H04N5/3658H04N5/3745H04N5/378
    • A cyclic A/D converter which can reduce the number of reference voltages for D/A conversion is provided. The cyclic A/D converter (11) comprises a gain stage (15), an A/D converter circuit (17), a logic circuit (19), and a D/A converter circuit (21). In an operational action of the gain stage (15), an operational value (VOP) is generated by the use of an operational amplifier circuit (23) and capacitors (25, 27, 29). The gain stage (15) operates as receiving three kinds of voltage signal from the D/A converter circuit (21) by the switching of two kinds of voltage signal (VDA1, VDA2) to be applied to the capacitors (25, 27) in a switching circuit (31). That is, the D/A converter circuit (21) provides a voltage signal (VRH) to the capacitors (25, 27), in response to a value (D=2) of a digital signal (B0, B1), provides voltage signals (VRH, VRL) to the capacitors (25, 27), respectively, in response to a value (D=1) of the signal (B0, B1), and provides the voltage signal (VRL) to the capacitors (25, 27), in response to a value (D=0) of the signal (B0, B1).
    • 提供了可以减少用于D / A转换的参考电压数量的循环A / D转换器。 循环A / D转换器(11)包括增益级(15),A / D转换器电路(17),逻辑电路(19)和D / A转换器电路(21)。 在增益级(15)的操作动作中,通过使用运算放大器电路(23)和电容器(25,27,29)产生运算值(VOP)。 增益级(15)通过切换要施加到电容器(25,27)的两种电压信号(VDA1,VDA2)来接收来自D / A转换器电路(21)的三种电压信号, 开关电路(31)。 也就是说,D / A转换器电路(21)响应于数字信号(B0,B1)的值(D = 2)向电容器(25,27)提供电压信号(VRH),提供电压 分别响应信号(B0,B1)的值(D = 1)向电容器(25,27)输出信号(VRH,VRL),并将电压信号(VRL)提供给电容器(25,27) 响应于信号(B0,B1)的值(D = 0)27)。