Tamal Mukherjee

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Simulation-based synthesis tools for analog circuits [1,2] face a problem extending their sizing/biasing methodology to larger block-level designs such as phase lock loops or converters: the time to fully evaluate (i.e., to fully simulate) each complete circuit solution candidate is prohibitive inside a numerical optimization loop. In this paper, we show(More)
Schematic-based lumped parameterized behavioral modeling and simulation methodologies have become available since the emergence of analog HDLs. They greatly ease iterative hierarchical multi-domain simulation, which is critical to the design of MEMS. NODAS is one of such tools, with models written in VerilogA and simulation performed within the Cadence(More)
Emerging results for mixed-domain circuit simulation, a component-level synthesis strategy, and a layout extractor is presented for use in design of microelectromechanical systems (MEMS). The mixed-domain circuit representation is based on Kirchhoffian network theory. Micromechanical and electromechanical components may be partitioned hierarchically into(More)
In this survey paper, we describe and contrast three different approaches for extending circuit simulation to include micromachined devices. The most commonly used method, that of using physical insight to develop parameterized macromodels, is presented first. The issues associated with fitting the parameters to simulation data while incorporating design(More)
We describe a synthesis system that takes operating range constraints and inter and intracircuit parametric manufacturing variations into account while designing a sized and biased analog circuit. Previous approaches to computer-aided design for analog circuit synthesis have concentrated on nominal analog circuit design, and subsequent optimization of these(More)
This paper presents a systematic modeling methodology for microfluidic concentration gradient generators. The generator is decomposed into a system of microfluidic elements with relatively simple geometries. Parameterized models for such elements are analytically developed and hold for general sample concentration profiles and arbitrary flow ratios at the(More)
A novel “current-mode ” Jumpling architecture for sample-andhold ( S b H ) ampli$ers results in a substantial reduction in error due to sampling clock jitter and aperture time. These reduced errors make possible a substantial reduction in power over a conventional “voltage-mode ” S b H with the same sample rate. In order to demonstrate the pegormance of(More)
RF building block circuits that can reconfigure from one frequency to another are of interest in multifunction radios. Reconfigurable MEMS capacitors are integrated with on-chip inductors and transistors to design reconfigurable VCO and filter circuits. Electrothermal actuation of the MEMS capacitor leads to >400 MHz change in operating frequency.