A simple current-mode Schmitt trigger employing only single MO-CTTA

Abstract

Abstract-

Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

“…For the results as shown in Figs. 33 and 34, they are the square and triangular-waves when I B2 and I B3 = 20, 60 and 100 lA, respectively, it can be found that the output amplitudes of square and triangular-wave can be respectively tuned by I B2 and I B5 without affecting the frequency deviation, as analyzed in (30), (31) and (33). The last result is shown in Fig.…”

“…Furthermore, its output amplitude and threshold cannot be independently/ electronically controlled, they are also dependent on supply voltages. Afterward, the current-mode Schmitt triggers using current controlled current conveyor transconductance amplifier (CCCCTA) [32] and multiple output current through transconductance amplifier (MO-CTTA) [33] have been presented. Their features of these circuits are that the output magnitude and hysteresis levels can be controlled via electronic method.…”

Voltage-controlled dual slope operation square/triangular wave generator and its application as a dual mode operation pulse width modulator employing differential voltage current conveyors

“…Comparing an input modulating signal V in with a carrier signal (triangular or saw-tooth waves) can generate a PWM signal. Previous studies have described PWM modulators based on different active building blocks [9,20,34,35]. Among them, two current tunable schemes (a sawtooth carrier-based PWM and a triangular carrier-based PWM) operated in voltagemode are designed using OTAs connected with an analog switch, a logic gate, and a few passive components [9].…”

“…When V o1 switches its output level from V o þ to V o À , D 1 becomes turn-off and D 2 becomes turn-on. This starts a discharging operation, causing V o2 with a linear decreasing slope expressed in (35). Utilizing the step-by-step analytic process described in Section 2.2, the expressions of the threshold levels and the peak-to-peak amplitude of the triangular wave can be derived as in Eqs.…”

Schmitt Trigger with Controllable Hysteresis Using Current Conveyors

“…Schmitt Triggers based on other active elements such as Current Through Transconductance Amplifier (CTTA) or Current Differencing Transconductance Amplifier (CDTA) can be found e.g. in [14], [15].…”