Contents I. Introduction
Square waveform generators are essential in the fields of instrumentation and measurement, communications, analog signal processing, bio-medical appliances and sensor networks relying on their operating frequency band [1]–[10]. Square wave signals are utilized as timing reference or clock signals in digital switching circuits [4], also suitable for triggering logic circuits at precise and determined intervals [8]. Square waves have multiple uses as clock signals, controlling ON or OFF and in sound synthesis to recognize different types of sounds from musical instruments. Also used in integrated sensor applications, roots to sawtooth oscillators or sweep generators, in analog devices as simple lamp flashers to tricky control systems and as pulse width control schemes for AF and RF applications [9]. Several methods exist in the literature using Voltage Mode (VM) and Current Mode (CM) operation, and based on the active building block employed for square wave generation [10]–[16], [19]&[21]. VM circuits have the limitations such as narrow unity gain bandwidth product, reports a trade-off between bandwidth verses speed, endures a low dynamic range and requires a more active and passive elements for implementation. These limitations can be gripped by using CM circuits, which persists better outcome in lexes of speed, bandwidth and accuracy [1]–[5]. Due to these benefits of CM approach over VM, these have emerged as a low power, high bandwidth solution, and as a trend setting design in analog ASIC. Furthermore it enjoy the features like superior speed, good operational accuracy and high design flexibility over the conventional VM amplifiers. In CM design, circuits are operated on branch currents rather than nodal voltages without letting node voltages to saturate [6]–[11].
