Browsing by Author "Yüce, B."

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    Fast and efficient circuit topologies for finding the maximum of n k-bit numbers
    (IEEE, 2014-08-01) Yüce, B.; Uğurdağ, Hasan Fatih; Gören, S.; Dündar, G.; Electrical & Electronics Engineering; UĞURDAĞ, Hasan Fatih
    Finding the value and/or index of the maximum (or minimum) element of a set of n numbers (each with k-bits) is a fundamental arithmetic operation and is needed in many applications. This paper proposes several maximum-finder (or minimum-finder) circuit topologies, which are parallel. We wrote circuit generators at hardware description language level for our topologies and previous works. Then we synthesized these circuits for 20 different (n, k) cases (with values up to 64) and compared their efficiency in timing (latency), area, and energy. The timing complexity of our fastest topology is O(log n + log k), whereas the fastest in the literature is O(log n log k). The synthesis results showed that our fastest topology is 1.2-2.2 times (1.6 times on the average) faster than the state-of-the-art. In this paper, we argue that a more fair metric of area efficiency is area-timing product. In terms of ATP, our proposed topologies are better than the state-of-the-art in 19 out of the 20 cases. In terms of energy (i.e., power-timing product, abbreviated as PTP), we are better in 11 cases out of 20.
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    Synthesis of clock trees for sampled-data analog IC blocks
    (IEEE, 2013) Yüce, B.; Korkmaz, S.; Esen, V. B.; Temizkan, Fatih; Tunç, Cihan; Güner, Gökhan; Başkaya, I. F.; Agi, İ.; Dündar, G.; Uğurdağ, Hasan Fatih; Electrical & Electronics Engineering; UĞURDAĞ, Hasan Fatih; Temizkan, Fatih; Tunç, Cihan; Güner, Gökhan
    This paper describes a methodology for automated design of clock trees in Sampled-Data Analog Circuits (SDACs). The current practice in the industry and academia for clock tree design of SDACs is a manual process, which is time-consuming and error-prone. Clock tree design in digital domain, however, is fully automated and is carried out by what we call Clock Tree Synthesis (CTS) software. In spite of some critical differences, SDAC clock tree design problem has fundamental similarities with its digital counterpart. As a result, we were able to construct a methodology for SDACs around a commercial digital CTS software and a set of Perl & Tcl scripts. We will explain our methodology using a 10-bit 180 MHz 2-stage ADC as a test circuit.