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象HA-2540之类的较宽频带的运算放大器很容易买到,用它们可以容易地装成10MHz左右的放大器。然而这种运算放大器的输入偏置电流大,而且偏置漂移等DC特性不太好,又因为发热多,所以初期漂移也成问题。当不仅重视带宽而且也重视在DC和低频的特性时,就可采用本文推荐的复合放大器结构。在高频时只有U_1工作;在低频,则由用DC特性好的U_2(例如OP-07等)组成的积分器帮助U_1工作。在低频,U_2的特性起决定性作用。
Broadband op amps such as the HA-2540 are readily available and can be easily mounted into amplifiers around 10MHz with them. However, this op amp input bias current, and DC offset drift characteristics such as DC is not very good, but also because of heat, so the initial drift is also a problem. When not only focusing on bandwidth but also focusing on DC and low frequency characteristics, the proposed composite amplifier architecture can be used. At high frequencies, only U_1 works; at low frequencies U_1 works with integrators made up of U 2 with good DC characteristics (eg OP-07, etc.). At low frequencies, the characteristics of U_2 play a decisive role.