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本文介绍用文氏桥方法提高运算放大器在确定频率下的开环增益。在不影响稳定性的前提下,将运算放大器因相位滞后补偿或电路分布参数而损失的有效开环增益恢复到低频的数值,或提得更高。早在七十年代初期QS17有源电桥的运算放大器设计就采用了此种方法,以克服运算指标和稳定性之间的矛盾、解决有效开环增益不足的问题,达到了0.002%信的闭环运算指标。在一般情况下,有效开环增益可以提高十倍以上。例如,从数百倍提高到近万倍,从数千倍提高到近十万倍。文中对电路及其调节作了必要的论述。
This article describes using the Wien-bridge method to improve the open-loop gain of an op amp at a defined frequency. Without compromising stability, the effective open-loop gain lost by the op amp due to phase lag compensation or circuit distribution parameters is restored to the lower frequency value or higher. As early as the early 1970s, QS17 active bridge op amp design used this method to overcome the conflict between the operation index and stability, to solve the problem of insufficient open-loop gain gain, reaching a closed loop of 0.002% of the letter Calculation index. Under normal circumstances, the effective open-loop gain can be increased more than tenfold. For example, from hundreds of times to nearly ten thousand times, from thousands of times to nearly one hundred thousand times. The paper makes the necessary discussion about the circuit and its regulation.