Duty cycle correction using negative feedback loop

An architecture has been proposed to attain a duty cycle of nearly 50% for single ended signals. The main idea is based on the fact that the average DC value of a signal is proportional to its Duty Cycle. So, if we assure that a signal and its inverted counterpart have equal average DC value, that particular signal will have a 50% duty cycle. A feedback circuit is used to compare the average DC values and correct the duty cycle of the signal. The duty correction circuit was implemented in 130 nm technology with a power supply of 1.2 V. It was found by simulation that the circuit gives nearly 50% duty cycle at the output for a 500 MHz signal when the input duty cycle is varied from 25% to 75%.