Low power duty cycle adjustment simple method in high speed serial links

Abstract

A low power method of clock signal duty cycle adjustment is presented in this paper. The proposed architecture produces a synchronous signal in the output of system with 50±1% duty cycle over PVT, which is needed to avoid data error and setup/hold time margins violations during farther operation with data. Method also helps to improve noise immunity, because in case of 50% duty cycle signal in the input of synchronous system makes it more noise protected and helps to avoid phase errors between control signals. The presented correction mechanism can be used in the special input/output circuits of several standards such as Peripheral Component Interconnect (PCI), Universal Serial Bus (USB) and some structures of ADC/DACs.

Duty Cycle Detection Method for High Speed Input-Output Systems

“…The DC correction circuit (Melikyan, 2015) main blocks are adjuster and detector (Figure 3). The adjuster regulates a code for getting desired DC and send it to DC detector.…”