公开(公告)号：US20110121880A1

公开(公告)日：2011-05-26

申请号：US12950193

申请日：2010-11-19

申请人： Young Jae LEE ,  Sang Sung Lee ,  Snag-Gun Lee

发明人： Young Jae LEE ,  Sang Sung Lee ,  Snag-Gun Lee

IPC分类号： H03L5/00

CPC分类号： H03F3/45968 ,  H03F2203/45212 ,  H03M1/822

摘要： A DC offset cancellation circuit includes: a control signal generation unit generating i (i is a natural number) number of pulse signals having a pulse width corresponding to a DC offset amount; a current source supplying i number of currents each having a different current ratio; a switching unit determining a current quantity to be supplied to a feedback capacitor by adjusting a turn-on quantity of each of the i number of currents according to the pulse width of each of the i number of pulse signals; and an electric charge quantity regulation unit charging DC offset electric charges corresponding to current supplied from the switching unit through the feedback capacitor and transferring the DC offset electric charges charged in the feedback capacitor to a sampling capacitor through a rotary capacitor, to allow the sampling capacitor to primarily store the DC offset electric charges and then secondarily store electric charges corresponding to an input signal. s

摘要翻译： DC偏移消除电路包括：控制信号生成单元，生成具有对应于DC偏移量的脉冲宽度的i（i是自然数）个脉冲信号; 电流源，其提供i个具有不同电流比的电流; 切换单元，根据i个脉冲信号中的每一个的脉冲宽度，调整i个电流的导通量，确定要提供给反馈电容器的电流量; 电荷量调节单元对通过反馈电容器从开关单元提供的电流充电DC偏移电荷，并将通过旋转电容器将充电在反馈电容器中的DC偏置电荷传送到采样电容器，以允许采样电容器 主要存储DC偏移电荷，然后二次存储对应于输入信号的电荷。 s