Title :
A programmable phase rotator based on time-modulated injection-locking
Author :
O´Mahony, Frank ; Casper, Bryan ; Mansuri, Mozhgan ; Hossain, Masum
Author_Institution :
Intel Corp., Hillsboro, OR, USA
Abstract :
A 7-bit 360° phase rotator in 45nm CMOS interpolates between coarse phases by modulating the injection point of an oscillator. This architecture decouples phase resolution from device sizing. INL and DNL are improved by independently adapting the delay of each oscillator stage. A digital phase-locked loop using a time-to-digital converter based on a tracking ADC keeps the oscillator tuned to the injection frequency. The measured DNL and INL at 4.05GHz with phase calibration are 0.4 and 1.2 LSBs, respectively, while consuming 14.3mW.
Keywords :
CMOS integrated circuits; analogue-digital conversion; injection locked oscillators; programmable circuits; CMOS; coarse phases; device sizing; digital phase-locked loop; injection frequency; phase resolution; programmable phase rotator; time-modulated injection-locking; time-to-digital converter; tracking ADC; Clocks; Delay; Frequency modulation; Jitter; Oscillators; Phase locked loops; Strontium; I/O; injection locked oscillator; phase rotator;
Conference_Titel :
VLSI Circuits (VLSIC), 2010 IEEE Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-5454-9
DOI :
10.1109/VLSIC.2010.5560263
