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本文对限制文氏桥振荡器调谐范围的主要原因作了分拆.为了展定文氏桥振荡器的调谐范围,文中利用复合型运算放大器来补偿单运放有限的增益带宽税的不利影响,并采用开关电容等效电阻,以获得稳定的大时间常数.实验结果表明了该方案的有效性,并已成功地应用于宽带高精度信号源的设计.
In this paper, the main reason for limiting the tuning range of the Wien-bridge oscillator is disassembled.In order to display the tuning range of the Wien-bridge oscillator, the compound operational amplifier is used to compensate the limited gain bandwidth gain of a single amplifier, And uses the equivalent capacitance of the switch capacitor to obtain a stable large time constant.The experimental results show the effectiveness of the scheme and have been successfully applied to the design of broadband high-precision signal sources.