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实用新型
CN205596078U 一种带输入电流补偿电路的低失调运算放大器 有权

一种带输入电流补偿电路的低失调运算放大器
摘要：
本实用新型公开了一种带输入电流补偿电路的低失调运算放大器。该低失调运算放大器具有较低的输入电流。所述带输入补偿电流的低失调运算放大器包括输入电流补偿单元、输入放大级单元、输出级单元以及相位补偿单元。输入电流补偿单元用来补偿由于采用双极型输入对管而引入的输入电流，改善运算放大器的输入失调；输入放大级单元采用折叠共源共栅结构，使用双极型器件作为输入对管，用来将微小的输入差分信号放大，得到输出值；输出级单元用来提供大的电流负载能力，保证运算放大器可以正常驱动后级电路；相位补偿单元用来补偿运算放大器的相位裕度，保证运算放大器在规定的使用模式下能稳定工作。
摘要（英）：

The utility model discloses a take arrival current compensating circuit's low imbalance operational amplifier. Should have lower arrival current by low imbalance operational amplifier. The low imbalance operational amplifier who takes input offset current includes arrival current compensation unit, input amplifier stage unit, output stage unit and phase place compensation unit. Arrival current compensation unit is used for the compensation because the ambipolar arrival current who inputs the geminate transistors and introduce of adoption improves operational amplifier's input imbalance, input amplifier stage unit adopts folding cascode structure, uses bipolar device as the input geminate transistors, is used for enlargeing minor input differential signal, obtains the output valve, the output stage unit is used for providing big current load ability, guarantees that operational amplifier can normally drive back level circuit, the phase compensation unit is used for compensating operational amplifier's phase margin, guarantees that operational amplifier can stable work under the usage pattern of regulation.

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