公开(公告)号：US07425868B2

公开(公告)日：2008-09-16

申请号：US11357564

申请日：2006-02-17

申请人： Ho-Jung Ju

发明人： Ho-Jung Ju

IPC分类号： H01F3/45

CPC分类号： H03F3/453 ,  H03F3/45798 ,  H03F2203/45431 ,  H03F2203/45521 ,  H03F2203/45681

摘要： A transconductor for substantially canceling or reducing a direct current (DC) output offset and a method thereof are provided. The transconductor includes a differential amplifier, a sensing circuit, and a feedback current generation circuit. The differential amplifier outputs output signals having a DC output offset therebetween due to a difference between input signals or a mismatch between input terminals. The sensing circuit senses the DC output offset and outputs a sensing signal. The feedback current generation circuit provides a feedback current for adjusting a level of the output signals to the input stage of the differential amplifier in response to the sensing signal. Accordingly, the transconductor substantially cancels or reduces the DC output offset between the output signals in response to the feedback current.

摘要翻译： 提供用于基本上抵消或减少直流（DC）输出偏移的跨导体及其方法。 跨导体包括差分放大器，感测电路和反馈电流产生电路。 差分放大器由于输入信号之间的差异或输入端子之间的不匹配而输出其间具有DC输出偏移的输出信号。 感测电路检测直流输出偏移并输出感测信号。 反馈电流产生电路响应于感测信号提供反馈电流，用于将差分放大器的输入级的输出信号的电平调节到差分放大器的输入级。 因此，跨导体基于反馈电流基本上抵消或减小输出信号之间的直流输出偏移。