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Single-ended To Differential Amplifier Design Tips - Design Note 454

机译:单端至差分放大器设计技巧-设计说明454

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摘要

A fully differential amplifier is offen used to convert a single-ended signal to a differential signal, a design which requires three significant considerations: the impedance of the single-ended source must match the single-ended impedance of the differential amplifier, the amplifier's inputs must remain within the common mode voltage limits and the input signal must be level shifted to a signal that is centered at the desired output common mode voltage.rnIn all cases, input impedance matching to the source impedance is necessary to prevent high frequency reflections. In designs where the single-ended source is DC coupled to a single supply differential amplifier, then level shifting and the common mode limits are also important considerations. The interaction of these three design parameters is non-trivial-component selection requires spreadsheet analysis using the equations described here.
机译:全差分放大器通常用于将单端信号转换为差分信号,这种设计需要三个重要考虑因素:单端源的阻抗必须与差分放大器的单端阻抗,放大器的输入相匹配。必须将其保持在共模电压限制之内,并且输入信号必须电平转换为以所需输出共模电压为中心的信号。在所有情况下,都必须使输入阻抗与源阻抗相匹配,以防止高频反射。在单端源直流耦合到单电源差分放大器的设计中,电平转换和共模限制也是重要的考虑因素。这三个设计参数的相互作用是非平凡的组件选择,需要使用此处描述的方程进行电子表格分析。

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