Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Special Section on Analog Circuit Techniques and Related Topics -- Papers |
A Novel Open Loop Structure for Phase Shifting and Frequency Synthesizing
1 The authors are with the Microelectronics Research Laboratory of Urmia University, Urmia, Iran. E-mail: Corresponding Author: sts.kazeminia{at}urmia.ac.ir
This paper presents a new open-loop phase shifter and frequency synthesizer which can be implemented by small hardware. In the proposed method the differential square wave is converted to a differential ramp. Then the cross points of two ramps are detected as the middle points of high or low durations and are recovered to full digital levels, for 90° shifting operation. 4-phases in 50 MHz frequency can be generated by 3.5 mW power consumption and 60 µm x 60 µm area. All circuits have been simulated in 0.35 µm CMOS technology.
Key Words: phase shifter, frequency synthesizer, frequency multiplier, DLL, PLL
Manuscript received June 21, 2007. Manuscript revised September 20, 2007.
Reference
[1] B. Razavi, Design of Analog CMOS Integrated Circuit, McGrow-Hill, New York, 2001. [2] A. Johns and K. Martin, Analog Integrated Circuit Design, John Wiley and Sons, New York, 1997. [3] A. Rezayee and K. Martin, "A Three stage coupled ring oscillator with quadrature outputs," Proc. Int. Symp. on Circuits and Systems, pp.484–487, IEEE, 2001.
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