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Automated Synthesis and Modeling of Analog and Mixed-Signal Systems . Alex Doboli, PhD Associate Professor Department of Electrical and Computer Engineering State University of New York, Stony Brook, NY 11794 Email: firstname.lastname@example.org.
Alex Doboli, PhD
Department of Electrical and Computer Engineering
State University of New York, Stony Brook, NY 11794
high degree of innovation:
mAutomated synthesis of analog and mixed-signal systems
Topology generation and
system architecture selection:
entity aaa is
floorplanning and global routing
Chain of Integrators with
Chain ofIntegrators with Distributed
Feedback, Distributed Feedforward
and Local Feedback
Chain of Integrators
with Distributed Feedback
Sensitivity cost function values are 1.723 and 2.250 respectively, with all (good case)
L. Huelsman, “Active and Passive Analog Filter Design”, McGraw Hill, 1993
Sensitivity cost function values is 4.454, with some terms larger than 1.0, e.g.
R. Schreier, “The Delta-Sigma Toolbox 6.0”, www.mathworks.com/matlabcentral/fileexchange, Nov 2003.
SpecificationsSynthesis of Reconfigurable DS Modulators
Y. Wei, H. Tang, A. Doboli, "Systematic Methodology for Designing Reconfigurable Delta Sigma Modulator Topologies for Multimode Communication Systems", invited paper, IEEE Transactions on CADICS, Vol. 26, No. 3, March 2007.
A cell phone chip
works for CDMA,
GSM, UMTS … …
Improvement as compared to the state-of-art design:
3dB for the case of -60dB noise level
5dB for the case of -50dB noise level
H. Tang, H. Zhang, A. Doboli, "Refinement based Synthesis
of Continuous-Time Analog Filters Through Successive Domain
Pruning, Plateau Search and Adaptive Sampling",
IEEE Transactions on CAD of Integrated Circuits and Systems,
Vol. 25, No. 8, pp. 1421-1440, 2006.
3rd order elliptic lowpass filter
Large sampling steps
Small sampling steps
Y. Wei, A. Doboli, "Structural Macromodeling of Analog
Circuits through Model Decoupling and Transformation",
IEEE Transactions on CADICS, Vol. 27, No. 4, April 2008.
H. Zhang, A. Doboli, "A Scalable Sigma-Space Based Methodology for Modeling Process Parameter Variations in Analog Circuits", Microelectronics Journal, Elsevier, February 2009.
H. Zhang, S. Doboli, H. Tang, A. Doboli, "Compiled Code Simulation of Analog and Mixed-Signal Systems Using Piecewise Linear Modeling of Nonlinear Parameters", Integration the VLSI Journal, Elsevier, Vol. 40, No. 3, pp. 193-209, 2007.
PWL segment control
Lazy generation of
symbolic expressionSimulation Methodology - overview
Terminal block analysis
Middle block analysis
Code generation and optimization
Spectre + VerilogXL(s)
Comment: Because of the extreme values of some parameters, we had severe convergence problems in Cadence Mixed-Signal Simulation Environment (Spectre + Verilog A).
Cristian Ferent and Alex Doboli
Coupling between nodes
Classification along curve D1
Features related to performance
Similar node features
Distinguishing criteria curves
C. Ferent, A. Doboli, "A Symbolic Technique for Automated Characterization of the Uniqueness and Similarity of Analog Circuit Design Features", DATE 2011
2) Group nodes with similar behavior:
3) Sort matched groups:
4) Use entropy to rank similarities and differences between circuits:
5) Produce hierarchy with maximum matching at higher levels
Identical Processing Path
Identical Control Path
Additional Control Voltages