A Novel Open Loop Structure for Phase Shifting and Frequency Synthesizing

Sarang KAZEMINIA  Khayrollah HADIDI  Abdollah KHOEI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A    No.2    pp.491-496
Publication Date: 2008/02/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.2.491
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
phase shifter,  frequency synthesizer,  frequency multiplier,  DLL,  PLL,  

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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 90shifting operation. 4-phases in 50 MHz frequency can be generated by 3.5 mW power consumption and 60 µm60 µm area. All circuits have been simulated in 0.35 µm CMOS technology.