Current-mode approach for wide-gain bandwidth product architecture

Abstract

This paper describes the architectures of a fully differential input/single-ended output wide-band high-gain current-mode comparator and amplifier. Both architectures employ a current conveyor as the primary means of current-mode operation. The proposed comparator circuit delivers extremely high gain and wide bandwidth by employing cascode complementary gain stages and feedforward compensation techniques, respectively. The closed-loop voltage amplifier, using the proposed current-mode techniques, can improve upon the gain-bandwidth product when compared to conventional voltage-mode techniques. Computer simulation results show 135 dB of gain and 100 MHz bandwidth for such an amplifier.