利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN103401529A 复数带通滤波器电路的直流偏差校正方法 有权 转让

  • 专利标题： 复数带通滤波器电路的直流偏差校正方法
  • 专利标题（英）： DC offset correction method of complex band pass filter circuit
  • 申请号： CN201310255594.6
    申请日： 2013-06-25
  • 公开(公告)号： CN103401529A
    公开(公告)日： 2013-11-20
  • 发明人: 杨俊杰 , 杨柳
  • 申请人： 杨俊杰 , 杨柳
  • 申请人地址： 江苏省南通市启东市滨海工业园中力路5号总经办
  • 专利权人： 杨俊杰,杨柳
  • 当前专利权人： 大连久卫电力科技有限公司
  • 当前专利权人地址： 116000 辽宁省大连市甘井子区黄浦路596号16层4号
  • 主分类号： H03H11/06
  • IPC分类号： H03H11/06
复数带通滤波器电路的直流偏差校正方法
摘要：
本发明公开了一种复数带通滤波器电路的直流偏差校正方法。步骤如下：（1）在中频接收和滤波器系统设计时使用同样阻值的衰减反馈电阻R和耦合频移电阻R0；（2）断开所有四个开关：SWI和SWQ，然后启动SAR取样反馈控制电路，改变Iq1电流源的幅度，使得I通道和Q通道的直流偏差同时减小到零；（3）接通SWI开关但断开SWQ开关，然后启动SAR取样反馈控制电路，改变Ii2电流源的幅度，使得I通道和Q通道的直流偏差同时减小到零；(4)接通开所有四个开关；理论上和实际电路中将直流偏差彻底减小到接近于零的水平，从而消除直流偏差对中频电路的影响，提高无线系统接收信号的动态范围。
摘要（英）：

The invention discloses a dc offset correction method of a complex band pass filter circuit. The method comprises the step that 1) in design of an intermediate-frequency reception and filter system, an attenuation feedback resistor R and a coupling frequency shift resistor R0 whose resistances are the same are used; 2) all of four switches are disconnected, wherein the switch SWI and the switch SWQ are disconnected, and an SAR sampling feedback control circuit is started to change the amplitude of a current source Iq1, so that dc offsets of a channel I and a channel Q are simultaneously decreased to zero; 3) the switch SWI is connected while the switch SWQ is still disconnected, the SAR sampling feedback control circuit is started to change the amplitude of a current Iq2, so that dc offsets of the channel I and the channel Q are simultaneously decreased to 0; and 4) all of the four switches are connected. The dc offsets are thoroughly decreased to the level approaching 0 in theory and practical circuit, thereby eliminating influence of the dc offsets on the intermediate-frequency circuit, and improving dynamic signal reception range of a wireless system.

公开/授权文献
0/0