通用短距离无线采集卡设计[外文翻译].doc

通用短距离无线采集卡设计文献翻译


HIGH SPEED OP AMPS
Walt Jung and Walt Kester
Modern system design increasingly makes use of high speed ICs as circuit building blocks. With bandwidths going up and up, demands are placed on the designer for faster and more power efficient circuits. The default high speed amplifier has changed over the years, with high speed complementary bipolar (CB) process ICs such as the AD846 and AD847 in use just about ten years at this writing. During this time, the general utility/availability of these and other ICs have raised the “high speed” common performance denominator to 50MHz. The most recent extended frequency complementary bipolar (XFCB) process high speed devices such as the AD8001/AD8002, the AD9631/9632 and the AD8036/AD8037 now extend the operating range into the UHF region.
Of course, a traditional performance barrier has been speed, or perhaps more accurately, painless speed. While fast IC amplifiers have been around for some time, until more recently they simply haven’t been the easiest to use. As an example, devices with substantial speed increases over 741/301A era types, namely the 318- amily, did so at the expense of relatively poor settling and capacitive loading characteristics. Modern CB process parts like the AD84X series provide far greater speed, faster settling, and do so at low user cost. Still, the application of high performance fast amplifiers is never entirely a cookbook process, so designers still need to be wary of many inter-related key issues. This includes not just the amplifier selection, but also control of parasitics

高速运算放大器
　　沃尔特•荣格和华特迪
　　现代系统设计越来越多使用高速集成电路作为电路模块的主要部分。随着带宽要求不断增加,现代的设计师需要更快和更高效的电路。伴随随着高速度(CB)互补双相性处理集成电路的发展，高速集成运放的技术也发展了许多年。例如AD846 和AD847，它们的使用到现在已将近十年。在这段时间，普遍使用的放大器和其他的高效集成电路性能速度达到了50MHz。最近，具有宽频率互补双极性的高速 (XFCB)放大器,像AD8001 / AD8002,AD9631/9632和AD8036 / AD8037频率已经达到了超高频。
当然,传统放大器的性能障碍就是速度，或者更准确的说，在数据无失真下的速度。虽然利用高速集成放大器设计电路已有一定的时间，但是，直到最近他们才简单而容易的应用在实际应用中。例如,以极大的速度设计的741/301A类型,即318 系列放大器,它们的速度很高，但是这样做的代价就是相对低的稳定性和负载电容特性。现代的互补双相性处理集成模块，使得像AD84X系列提供更高的速度,更快的转换速度，同时也降低了用户成本。然而，在实际应用中，对高性能的高速运放的设计并不简单，因此设计师需要小心许多相关联的关键性问题。这不仅仅包括放大器选择,还包括周围电路寄生效应的影响和其它潜在的性能影响。