Current-Mode Monostable Multivibrators Using OTRAs

Three nonretriggerable current-mode monostable multivibrators constructed of one operational transresistance amplifier (OTRA) and a few passive elements are presented in this brief. Two of these circuits are operated respectively under positive and negative triggering modes. However, the recovery time cannot be adjusted once the pulsewidth is decided. The third topology, which can work in either triggering mode, features a tunable recovery time. The proposed current-mode monostables are simpler compared to their counterparts composed of operational amplifiers. The circuit operations are described in detail. Experimental results are in good agreement with the theoretical analysis