公开(公告)号：US20110169990A1

公开(公告)日：2011-07-14

申请号：US13050470

申请日：2011-03-17

申请人： Masahiro HIGUCHI ,  Hiroshi Kimura

发明人： Masahiro HIGUCHI ,  Hiroshi Kimura

IPC分类号： H04N5/335 ,  H03M1/00 ,  G05F1/10

CPC分类号： H03M1/664 ,  H03K4/48 ,  H03M1/123 ,  H03M1/56 ,  H03M1/68 ,  H03M1/745 ,  H03M1/785 ,  H03M1/808

摘要： A linear relationship is established between a gain control signal and an amplification factor (value in dB). Described is a current generation circuit including a first current output section which outputs a first current, a second current output section which outputs a second current proportional to the first current, and a variable-current control section which generates a third current proportional to the first current, divides the third current into a fourth current and a fifth current according to a first control signal, and outputs the fourth and the fifth currents. The current generation circuit outputs a sum of the first and the fourth currents as a reference current, and a sum of the second and the fifth currents as an output current.

摘要翻译： 在增益控制信号和放大系数之间建立线性关系（以dB为单位）。 描述了包括输出第一电流的第一电流输出部分，输出与第一电流成比例的第二电流的第二电流输出部分的电流产生电路和产生与第一电流成比例的第三电流的可变电流控制部分 电流，根据第一控制信号将第三电流分成第四电流和第五电流，并输出第四和第五电流。 电流产生电路输出第一和第四电流的和作为参考电流，并且输出第二和第五电流的和作为输出电流。