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发明公开
CN101933227A 具有准确输入偏移电压的差动放大器 无效 - 撤回

具有准确输入偏移电压的差动放大器
摘要：
本发明描述一种具有准确输入偏移电压的放大器(209)。在一种设计中，所述放大器包括第一和s(312、314)接收差动输入信号并提供第一差动电流信号。第二不平衡差动对(322、324)接收差动参考信号(Vref p、Vref n)并提供第二差动电流信号，从所述第一差动电流信号中减去所述第二差动电流信号以获得差动输出信号Ioutp、Iout n)。所述第二差动电流信号追踪所述第一差动电流信号中的误差电流，以使得当所述差动输入信号等于所述放大器的目标输入偏移电压时所述差动输出信号为零。对于每一不平衡差动对来说，一个晶体管为另一晶体管的尺寸的M倍，其中选择M以获得所述目标输入偏移电压。
摘要（英）：

An amplifier (209) with accurate input offset voltage is described. In one design, the amplifier includes first and s (312, 314) receives a differential input signal and provides a first differential current signal. The second unbalanced differential pair (322, 324) receives a differential reference signal (Vref p, Vref n) and provides a second differential current signal, which is subtracted from the first differential current signal to obtain a differential output signal Ioutp, lout n) The second differential current signal tracks an error current in the first differential current signal so that the differential output signal is zero when the differential input signal is equal to a target input offset voltage for the amplifier. For each unbalanced differential pair, one transistor is M times the size of the other transistor, with M being selected to obtain the target input offset voltage.

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