公开(公告)号：US07504974B2

公开(公告)日：2009-03-17

申请号：US11902472

申请日：2007-09-21

申请人： Masao Iriguchi

发明人： Masao Iriguchi

IPC分类号： H03M1/62

CPC分类号： H03K17/005 ,  H03F1/32 ,  H03F1/3211 ,  H03F3/45475 ,  H03F2203/45136 ,  H03F2203/45166 ,  H03F2203/45171 ,  H03F2203/45226 ,  H03F2203/45528 ,  H03F2203/45534 ,  H03F2203/45616 ,  H03F2203/45726 ,  H03K17/14 ,  H04J3/047

摘要： A selecting circuit having minimal signal distortion caused by non-linearity of semiconductor switching elements includes a plurality of circuit groups each comprising an input terminal (INa); serially connected resistors (R1a, R2a) having a first end connected to the input terminal; a semiconductor switching element (SW1a) having a first end connected to a node between the resistors; and semiconductor switching elements (SW2a, SW3a) having first ends connected to a second end of the resistors (R1a, R2a). The circuit further includes an operational amplifier (OP) having an inverting input terminal to which second ends of semiconductor switching elements (SW1a, SW1b, . . . , SW1n) in respective ones of the circuit groups are connected in common, and an output terminal to which second ends of semiconductor switching elements (SW2a, S2b, . . . , SW2n) in respective ones of the circuit groups are connected in common; and an output terminal (OUT) to which second ends of semiconductor switching elements (SW3a, SW3b, . . . , SW3n) in respective ones of the circuit groups are connected in common.

摘要翻译： 具有由半导体开关元件的非线性引起的信号失真最小的选择电路包括多个电路组，每个电路组包括输入端（INa）; 串联的电阻器（R1a，R2a），其第一端连接到输入端子; 半导体开关元件（SW1a），其具有连接到所述电阻器之间的节点的第一端; 和具有与电阻器（R1a，R2a）的第二端连接的第一端的半导体开关元件（SW2a，SW3a）。 电路还包括具有反相输入端的运算放大器（OP），各个电路组中的半导体开关元件（SW1a，SW1b，...，SW1n）的第二端共同连接到该反相输入端子，输出端子 各个电路组中的半导体开关元件（SW2a，S2b，...，SW2n）的第二端共同连接; 以及各个电路组中的半导体开关元件（SW3a，SW3b，...，SW3n）的第二端共同连接的输出端子（OUT）。