IEICE TRANSACTIONS on Fundamentals
A Device-Level Placement with Schema Based Clusters in Analog IC Layouts
Summary :
A challenge to an automated layout of analog ICs starts with the insight into high quality placements crafted by experts. We observe first that matched devices or elemental functions such as input, output, amplifiers, etc are clustered. Second, devices in the same cluster are located faithfully to the drawn schema. Third, these two features are simultaneously fulfilled in a well-compacted placement. This paper proposes a novel device-level placement that simulates the above features based on Sequence-Pair. A slight modification of the meaning, say, of relation "A is left-of B" to relation "A is not right-of B" enlarges the freedom and allows a neater compaction of clusters allowing zigzag border curves. As the consequence, clusters are placed faithfully to relative position in the schema. We tested our algorithm for industrial instances and compared results with those by manual design. The results showed better features in performance figures than the those of manual designs by, on average, 13.5% and 21.2% with respect to the area and total net-length.
- Publication
- IEICE TRANSACTIONS on Fundamentals Vol.E87-A No.12 pp.3301-3308
- Publication Date
- 2004/12/01
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
- Category
- Analog Layout
Authors
Keyword
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Takashi NOJIMA, Xiaoke ZHU, Yasuhiro TAKASHIMA, Shigetoshi NAKATAKE, Yoji KAJITANI, "A Device-Level Placement with Schema Based Clusters in Analog IC Layouts" in IEICE TRANSACTIONS on Fundamentals,
vol. E87-A, no. 12, pp. 3301-3308, December 2004, doi: .
Abstract: A challenge to an automated layout of analog ICs starts with the insight into high quality placements crafted by experts. We observe first that matched devices or elemental functions such as input, output, amplifiers, etc are clustered. Second, devices in the same cluster are located faithfully to the drawn schema. Third, these two features are simultaneously fulfilled in a well-compacted placement. This paper proposes a novel device-level placement that simulates the above features based on Sequence-Pair. A slight modification of the meaning, say, of relation "A is left-of B" to relation "A is not right-of B" enlarges the freedom and allows a neater compaction of clusters allowing zigzag border curves. As the consequence, clusters are placed faithfully to relative position in the schema. We tested our algorithm for industrial instances and compared results with those by manual design. The results showed better features in performance figures than the those of manual designs by, on average, 13.5% and 21.2% with respect to the area and total net-length.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e87-a_12_3301/_p
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@ARTICLE{e87-a_12_3301,
author={Takashi NOJIMA, Xiaoke ZHU, Yasuhiro TAKASHIMA, Shigetoshi NAKATAKE, Yoji KAJITANI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Device-Level Placement with Schema Based Clusters in Analog IC Layouts},
year={2004},
volume={E87-A},
number={12},
pages={3301-3308},
abstract={A challenge to an automated layout of analog ICs starts with the insight into high quality placements crafted by experts. We observe first that matched devices or elemental functions such as input, output, amplifiers, etc are clustered. Second, devices in the same cluster are located faithfully to the drawn schema. Third, these two features are simultaneously fulfilled in a well-compacted placement. This paper proposes a novel device-level placement that simulates the above features based on Sequence-Pair. A slight modification of the meaning, say, of relation "A is left-of B" to relation "A is not right-of B" enlarges the freedom and allows a neater compaction of clusters allowing zigzag border curves. As the consequence, clusters are placed faithfully to relative position in the schema. We tested our algorithm for industrial instances and compared results with those by manual design. The results showed better features in performance figures than the those of manual designs by, on average, 13.5% and 21.2% with respect to the area and total net-length.},
keywords={},
doi={},
ISSN={},
month={December},}
Copy
TY - JOUR
TI - A Device-Level Placement with Schema Based Clusters in Analog IC Layouts
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3301
EP - 3308
AU - Takashi NOJIMA
AU - Xiaoke ZHU
AU - Yasuhiro TAKASHIMA
AU - Shigetoshi NAKATAKE
AU - Yoji KAJITANI
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E87-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 2004
AB - A challenge to an automated layout of analog ICs starts with the insight into high quality placements crafted by experts. We observe first that matched devices or elemental functions such as input, output, amplifiers, etc are clustered. Second, devices in the same cluster are located faithfully to the drawn schema. Third, these two features are simultaneously fulfilled in a well-compacted placement. This paper proposes a novel device-level placement that simulates the above features based on Sequence-Pair. A slight modification of the meaning, say, of relation "A is left-of B" to relation "A is not right-of B" enlarges the freedom and allows a neater compaction of clusters allowing zigzag border curves. As the consequence, clusters are placed faithfully to relative position in the schema. We tested our algorithm for industrial instances and compared results with those by manual design. The results showed better features in performance figures than the those of manual designs by, on average, 13.5% and 21.2% with respect to the area and total net-length.
ER -
English
