A Schmitt trigger based on DDCCTA without any passive components

Among various active building blocks, the Differential Difference Current Conveying Transconductance Amplifier (DDCCTA) is emerging as a very flexible and versatile building blocks for analog circuit design and has been used for realizing a variety of functions. In this paper, a new current-mode electronically-tunable Schmitt trigger circuit is proposed using Differential Difference Current Conveyor Transconductance amplifier (DDCCTA). The proposed Schmitt trigger consists of single DDCCTA block without any passive components which is advantageous from the point of view of an integrated circuit manufacturing. The performance of the proposed Schmitt trigger circuit is examined using Cadence and the model parameters of a 0.18 μm CMOS process.