电流反馈放大器.pdf

Current Feedback Amplifiers National Semiconductor Corporation 电流反馈放大器 美国国家半导体公司 Current Feedback Amplifiers 声明： 本文为中国电子网社区 网友NE5532 翻 译，在翻译中得到了中国电子网和广大社区网友的帮助，在这里 一并致谢。 本文仅供大家学习参考，并不得用于商业目的。 欲索取国家半导体公司的原版资料，请查询国家半导体网站 模拟技术大学栏目。 西南科技大学（SWUST ） 江海波（NE5532 ） 2004-7 电流反馈放大器 1. The Conventional OP Amp 6 2. Gain Bandwidth Tradeoff10 3. Slew-Rate Limiting 13 4. The Current-Feedback Amplifier 16 5. No Gain-Bandwidth Tradeoff 22 6. Absence of Slew-Rate Limiting 25 7. Second-Order Effects27 8. CF Applications Considerations 32 9. CF Integrators 34 10. Stray Input-Capacitance Compensation 36 11. 译注：37 Current Feedback Amplifiers In their effort to approximate the ideal OP amp, manufacturers must not only maximize the open-loop gain and minimize input-referred errors such as offset voltage, bias current, and noise, but must also ensure adequate band-width and settling-time characteristics. Amplifier dynamics are particularly important in applications like high-speed DAC buffers, subranging ADCs, S/H circuits, ATE pin drivers, and video and IF drivers (Reference 1) Being basically voltage-processing devices, OP amps subject to the speed limitations inherent to voltage-mode operation, stemming primarily from the stray capacitances of nodes and the cutoff frequencies of transistors. Particularly severe is the effect of the stray capacitances between the input and output nodes of h