This study presents a 1-5.6 Gb/s CMOS clock and data recovery (CDR) integrated circuit (IC) implemented in a 0.13 μm CMOS process. The CDR uses a half-rate linear phase detector (PD) of which static phase offset is compensated by an additional binary PD and a digital charge pump (CP) calibration block. During initialisation, the static phase offset is detected by the binary PD and the CP current is controlled accordingly to compensate the static phase offset. Also, the architecture of this CDR IC is designed for a clock embedded serial data interface which transfers CDR training clock patterns before normal random data signals. The implemented IC consumes 16-22 mA from a 1.2 V core supply for data rates of 1-5.6 Gb/s and 20 mA from a 3.3 V I/O supply for two preamplifiers and low-voltage differential signalling drivers. When the 2 31-1 pseudorandom binary sequence is used, the measured bit-error rate is better than 10-12 and the jitter tolerance is 0.3UI pp. The recovered clock jitter is 21.6 and 4.2 ps rms for 1 and 5.6 Gb/s data rates, respectively.
Abstract-This paper presents a DC-DC buck converter which uses a sleep control to improve the power efficiency in a few mW light load condition. The sleep control turns off analog controller building blocks to reduce the static power losses during the offduty period of pulse width modulation. For verification, a buck converter has been implemented in a 0.18 mm CMOS process. The power efficiency has been improved from 76.7% to 82.5% with a 1.2 mW load. The maximum power efficiency is 95% with a 9 mW load.
Abstract:A simple odd number frequency divider with 50% duty cycle is presented. The odd number frequency divider consists of a general odd number counter and the proposed duty cycle trimming circuit. The duty cycle trimming circuit can output 50% duty cycle with only additional six transistors. A prototype divide-by-5 circuit with 50% duty cycle was implemented for a 500-Mb/s ∼ 5.6-Gb/s 1:10 CDR/DEMUX IC in a 0.13 µm 1P8M CMOS process.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.