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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(2):491-496; doi:10.1093/ietfec/e91-a.2.491
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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

Sarang KAZEMINIA1, Khayrollah HADIDI1 and Abdollah KHOEI1

1 The authors are with the Microelectronics Research Laboratory of Urmia University, Urmia, Iran. E-mail: Corresponding Author: sts.kazeminia{at}urmia.ac.ir


  Abstract

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.


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