1-99% input duty 50% output duty cycle corrector

This work presents a high bandwidth and wide input duty range duty cycle corrector. A combined charge pump stabilizes the current/sink. A second order differential low-pass filter enhances the stability of the closed loop. A simplified low-voltage amplifier increases the input common-mode range. The accuracy of output duty cycle, the operating frequency range and the stability of the circuit are improved. Using 0.18mum in CMOS process for simulation, the circuit obtains 50% output duty at 800-MHz with 1-99% input duty cycle at a minimum supply voltage of 1.2V. The minimum and maximum operating frequencies are 20-MHz and 2.6-GHz at 1.8V supply voltage, respectively