A Differential Dual delay mode Schmitt Trigger with 449ps delay gap by Reconfiguring with one bit and FVF current source

In this paper a new dual delay mode Schmitt Trigger (ST) with adjustable delay and hysteresis width in run time and design time is proposed. This delay element, can reconfigure by a digital mode select bit from ST mode to comparator mode and the input to output delay changes 449ps (7.97GHz frequency shift). Also it has tunable delay by changing bias of the feedback Flipped Voltage Follower (FVF) current source in design time. The proposed differential Schmitt trigger has SCL based design which keeps the power profile almost uniform vs changing the delay. Differential configuration make a low delay variation in Monte Carlo analysis 0.129ppm (234.4mv deviations in 1800mv) in hysteresis. The power consumption and delay of proposed delay element are 103-581ps and 4.23-1.04mW for ST and comparator mode, sequentially. The simulations results are in CMOS 180nm standard technology. The conclusion is that the dual band Schmitt trigger is appropriate in multi band and high performance applications