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发明授权
CN105305989B 轨到轨运算放大器 有权

轨到轨运算放大器
摘要：
本发明涉及一种轨到轨运算放大器，包括轨到轨输入级电路、上行电流补偿电路、下行电流补偿电路、输出级电路和电流镜像电路，轨到轨输入级电路分别连接上行电流补偿电路、下行电流补偿电路、电流镜像电路和输出级电路，电流镜像电路还连接上行电流补偿电路、下行电流补偿电路和输出级电路；电流镜像电路提供偏置电流，轨到轨输入级电路接入共模电平信号并输出至输出级电路，输出级电路用于对共模电平信号进行处理输出放大信号，上行电流补偿电路和下行电流补偿电路分别用于在共模电平信号的电压上行或电压下行时对轨到轨输入级电路的工作电流进行补偿，使轨到轨输入级电路的工作电流保持恒定，轨到轨运算放大器的轨到轨输入级电路的跨导波动小。
摘要（英）：

The invention relates to a rail-to-rail operational amplifier, comprising a rail-to-rail input stage circuit, an up current compensating circuit, a down current compensating circuit, an output stage circuit and a current mirror circuit, wherein the rail-to-rail input stage circuit is connected with the up current compensating circuit, the down current compensating circuit, the current mirror circuit and the output stage circuit; the current mirror circuit is also connected with the up current compensating circuit, the down current compensating circuit and the output stage circuit; the current mirror circuit provides a bias current; the rail-to-rail input stage circuit accesses a common mode level signal and outputs the common mode level signal to the output stage circuit; the output stage circuit is used for processing the common mode level signal to output an amplified signal; the up current compensating circuit and the down current compensating circuit are respectively used for compensating the working current of the rail-to-rail input stage circuit when the voltage of the common mode level signal goes up or down, so that the working current of the rail-to-rail input stage circuit keeps constant and the transconductance fluctuation of the rail-to-rail input stage circuit of the rail-to-rail operational amplifier is small.

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