FEEDBACK NETWORK FOR HIGH GAIN AMPLIFICATION WITH ENHANCED BANDWIDTH AND GAIN CONTROL

摘要

The system is an amplifier feedback circuit that permits a significant increase in useable bandwidth with comparable gain compared to amplifiers of the present art incorporating conventional feedback circuit topologies. The increased bandwidth is accomplished by significantly increasing the frequency of the pole in the transfer characteristic that is formed by the feedback resistor and the parasitic amplifier input capacitance. Embodiments shown include application to a transimpedance amplifier such as used with photo detector diodes in fiber optic receiver circuits. A basic voltage input, voltage output, operational amplifier circuit embodiment is also shown. Means for controlling the gain of the amplifier with a variable resistor that may be implemented with a digital potentiometer is shown.