Wideband precision fixed-gain amplifier architecture, apparatus, and method

摘要

An apparatus and method is disclosed for improving the gain precision and bandwidth of fixed-gain amplifiers, while providing high bandwidth and performance necessary in many applications. Fixed-gain amplifiers, having relatively precise gain, are connected together in a specific architecture to further increase the gain precision and bandwidth over any of the amplifiers operating independently. Due to the configuration of the amplifiers, the absolute gain error of individual amplifiers is substantially canceled such the gain error of the total circuit is greatly reduced. The disclose architecture is useful in many high speed, high bandwidth applications where very precise gain is needed, while avoiding the reduction in bandwidth caused by amplifiers using feedback to achieve gain stability.