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为了提高转换速率和降低偏压漂移,运用了由一个双极运算放大器和一个 BIFET 运算放大器倒相组合成的混合运算放大器这类组合运算放大器的性能优于分列的单片运算放大器——转换速率最快为12V/μS,偏压漂移保持低于0.9μV/℃。在电路中(见图)低漂移双极型运算放大器 A_1控制直流和低频信号,A_1将总接点与地之间的电压进行比较并差分放大。这个误差电压加到高速转换 BIFET 运算放大器 A_2的非反向输入端去校正 A_2的偏差。A_1能使组合运算放大器的偏差为零;否则,电路的偏差将是 A_1的初始偏差。
In order to improve the slew rate and reduce the bias drift, using a combination of a bipolar op amp and a BIFET op-amp hybrid op amp composite op amp performance superior to the performance of the listed monolithic op amp - conversion The fastest rate of 12V / μS, bias drift remains below 0.9μV / ℃. In the circuit (see picture) Low-drift bipolar op amp A_1 controls the DC and low-frequency signals, and A_1 compares the voltage across the total contact to ground and differentially amplifies it. This error voltage is applied to the non-inverting input of the high-speed translation BIFET op amp A_2 to correct the deviation of A_2. A_1 enables the combined op amp’s bias to be zero; otherwise, the circuit’s bias will be the initial bias of A_1.