专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明专利

JP2010278952A Successive approximation a/d converter circuit, and semiconductor integrated circuit 审中-公开
标题翻译：连续逼近A / D转换器电路和半导体集成电路
公开(公告)号：JP2010278952A
公开(公告)日：2010-12-09
申请号：JP2009131902
申请日：2009-06-01
申请人： Mitsumi Electric Co Ltd , ミツミ電機株式会社
发明人： INOUE FUMIHIRO
IPC分类号： H03M1/46
CPC分类号： H03M1/0697 , H03M1/468
摘要： PROBLEM TO BE SOLVED: To correct errors resulting from switching noise generated in a comparison circuit and improve conversion accuracy without inviting an increase in area, reduction in conversion rate or increase in consumption current in a successive approximation analog-digital (AD) converter circuit.
SOLUTION: In the successive approximation AD converter circuit provided with the comparison circuit including a plurality of amplifier stages cascade-connected via a coupling capacitance for evaluating sizes of input analog voltage and comparison voltage, a capacitance with one terminal connected to an input terminal of a first stage of amplifier stages in the comparison circuit, a sub-DA converter circuit having a switching means capable of switching voltages to be applied to another terminal of the capacitance based on an output from the comparison circuit, and a control circuit which can generate a control signal for the sub-DA converter circuit depending on the output from the comparison circuit to allow the comparison circuit to perform a redundancy comparison as well as can execute an averaging processing of the outputs from the comparison circuit to generate correction signal of a value for a register are provided to allow to execute the redundancy comparison action using a result of a normal AD conversion action as a start value after the AD conversion action.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：为了校正在比较电路中产生的开关噪声产生的错误，并且提高转换精度，而不会增加逐次逼近模拟数字（AD）中的面积增加，转换速率的降低或消耗电流的增加，转换器电路。解决方案：在具有比较电路的逐次逼近AD转换器电路中，包括通过用于评估输入模拟电压和比较电压的大小的耦合电容级联连接的多个放大器级，一个端子连接到输入端的电容在比较电路中的放大器级的第一级的端子，具有开关装置的子DA转换器电路，该开关装置能够基于比较电路的输出切换施加到电容的另一个端子的电压;以及控制电路，可以根据比较电路的输出产生用于子DA转换器电路的控制信号，以允许比较电路执行冗余比较，并且可以执行来自比较电路的输出的平均处理，以产生校正信号提供寄存器的值以允许使用ar执行冗余比较动作将AD转换动作作为AD转换动作后的起始值。版权所有（C）2011，JPO＆INPIT

IPRDB

热门服务

关于我们

友情链接

联系方式