| | | Document Type | : | Latin Dissertation | | Language of Document | : | English | | Record Number | : | 55328 | | Doc. No | : | TL25282 | | Call number | : | MR06804 | | Main Entry | : | Muhammad Usama | | Title & Author | : | Current mode logic latch and prescaler design optimization in 0.18μm CMOS technologyMuhammad Usama | | College | : | Carleton University (Canada) | | Date | : | 2005 | | Degree | : | M.A.Sc. | | student score | : | 2005 | | Page No | : | 114 | | Abstract | : | This thesis begins with a discussion of clocked storage elements in general, and then narrows its focus to current-mode logic (CML) after simulation results for high speed applications have been considered. Emphasis is given to the more important circuit characteristics, especially those involving timing and metastable behavior. The results of simulations involving high-speed devices using a number of established technologies decisively militated for the CMOS current-mode logic model, at least in the case of 0.18μm CMOS design rules. A consideration of past efforts to improve the characteristics of CML devices results in a new 'clock feedback' CML (CFCML) latch being proposed. An explicit circuit example to demonstrate the advantages of CFCML was needed. What was selected for this purpose was the high-frequency static frequency divider, two versions of which were designed and fabricated (TSMC 0.18μm CMOS technology). It was found that a 10GHz CFCML divider requires only 350μA current from a 1.2V supply (0.42 mW) and has an input sensitivity of 10mV at 9.4GHz. The performances of two different implementations of a 3/4 dual-modulus prescaler, one involving an external modulus control block, and the other an embedded one, are compared. A model for an asynchronous divider architecture which offers savings of 20% for each of power consumption and chip area is reported. | | Subject | : | Applied sciences; Electrical engineering; 0544:Electrical engineering | | Added Entry | : | Carleton University (Canada) |
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