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1 Electronics and Telecommunications Quarterly

1 2009

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Duty Cycle Correction Using Negative Feedback Loop

100%

Patil S. , Rudraswamy S. B.

Electronics and Telecommunications Quarterly

2009

tom Vol. 55, No 4

577-583

An architecture has been proposed to obtain 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 the 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 130nm 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 500MHz signal when the input duty cycle is varied from 25% to 75%.