Stacy W. Mehranfar "A technology-independent approach to custom analog cell generation", IEEE JSSC, vol. 26. No. 3, pp. 386-393, March 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....examples employed in industrial projects are illustrated. 1. Introduction In the past decades, efforts were dedicated to the development of layout automation methodologies for analog circuits. A tool, which can automatically generate full custom layouts for analog circuits was presented in [1]. Various types of circuit compilers were also proposed for fixed circuit topologies, such as the Continuous Time Filter compiler described in [2] Besides these, basic transistor cell generators were also developed to increase the productivity of layout design [3] More recently, a methodology to ....

Stacy W. Mehranfar "A technology-independent approach to custom analog cell generation", IEEE JSSC, vol. 26. No. 3, pp. 386-393, March 1991.

.... low level physical layout generation and schematic synthesis using architectural selection paradigms have been proposed [1] 2] Methods for very specific mid to low level circuits have also been proposed [3] More recently automatic support tools for the experienced designer have been developed [4]; however, none of these provide integration of all of these features and missing from them are some of what we believe to be very fundamental ones. In this paper, we propose a new design methodology and the necessary set of tools that supports it for effective analog design. The key points of our ....

S. W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell 64eneration", IEEE Journal of Solid State Circuits, vol. 26, n. 3, pp. 386 393, March 1991.

....reduce the CPU time needed for the placement phase of analog IC s. Typically these approaches have not achieved the same layout density and flexibility obtained by expert designers. Others [3] suggested a knowledge based approach, or required the user to provide basic hints on the layout structure [4]. In [5] very effective analog specific placement and routing tools accounting for topological constraints have been provided for full custom layout. A routing methodology for the minimization of cross coupling has been proposed. However, no method is given to define the actual bounds for the ....

S. W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell Generation", IEEE Journal of Solid State Circuits, vol. 26, n. 3, pp. 386--393, March 1991.

....general classes. Procedural approaches use deterministic algorithms to place devices, optimizing device sizes in a template [KOH89, JUSU92,DEGR89] or successively splitting the circuit into smaller parts until all devices have been placed [BERK88, KAYA88, LIN91, CONW92, MEYE93, CHEN89, MOGA89, MEHR91, ONOD92] Routing techniques seek to limit parasitics through controlling parasitic resistance and capacitive coupling [HARA92, SMIT89, CHOU90] Simulated annealing (SA) approaches use nonlinear SA optimization to place devices, incorporating matching and parasitic rules into the move set and ....

S.W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell Generation," IEEE Journal of Solid State Circuits, 26(3), March 1991, pp. 386-392. [Another schematic to layout tool, preserving qualitative user inputs.]

....using a pattern database. An enhanced set of stacks is obtained with respect to placement constraints. Experimental results show the effectiveness of the methods described. 1. Introduction In the last decade, some attempts have been made to develop automation for analog circuit layout design [1, 2, 3, 4]. Since the constraints for analog and digital design are different, the techniques for digital circuits cannot be easily ported to analog design. Analog physical design has to deal with special requirements for matching, symmetry, parasitics and for the variety of transistor sizes. The layout ....

S. S.W. Mehranfar. A technology-independent approach to custom analog cell generation. IEEE J. Solid-State Circ., 26(3):386--393, Mar. 1991.

....are preserved by setting the minimum separation between horizontal segments in a channel, and by ordering them to avoid crossovers (if possible) In [20] cross coupling minimization is the routing target, while stray resistances are controlled by means of variable wire segment widths. In stat [21] and in koan anagram [22] placement and routing rely on weighted parasitic minimization and matching constraint enforcement. Area routing and unconstrained placement with abutment capability provide the layout with high flexibility and good area performance. However, no clear strategy is ....

S. W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell Generation", IEEE Journal of Solid State Circuits, vol. 26, n. 3, pp. 386--393, March 1991.

....this algorithm provides a suitable performance driven approach to analog layout module generation. Examples are reported showing the effectiveness of our approach. 1. INTRODUCTION In recent years, several approaches to the automatic synthesis of analog integrated circuits have been proposed [1, 2, 3]. Significant efforts have been made toward a consistent performance driven methodology [4] such that the respect of high level specifications is guaranteed in all design stages. However, a severe discontinuity is present between schematic definition and physical implementation. Most of the ....

S. W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell Generation", IEEE Journal of Solid State Circuits, 26:3, pp. 386--393, March 1991.

....graph structure, using the results of the symmetry algorithm. The method has been implemented in the A warD program. Test cases demonstrate the effectiveness of the method. 1. Introduction In recent years, automated methods for the design of analog integrated circuits have been proposed [1, 2, 3]. These methods helped the IC designers in handling the increasing complexity of the IC designs. Late stages of the IC design process, i.e. the layout design, are usually repeated several times until an acceptable layout is obtained, due to the specific constraints of analog circuits. Analog ....

S. S.W. Mehranfar. A technology-independent approach to custom analog cell generation. IEEE J. Solid-State Circ., 26(3):386--393, Mar. 1991.

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S. W. Mehranfar, "A Technology-Independent Approach to Custom Analog Cell Generation," IEEE J. Solid-State Circuits, Vol. 26, No. 3, pp. 386-393, March 1991.

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