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A new coupled circuit and electrostatic/mechanical simulator (COSMO) is presented for the design of low phase noise radio frequency (RF) microelectromechanical systems (MEMS) voltage-controlled oscillators (VCOs). The numerical solution of device level equations is used to accurately compute the capacitance of a MEMS capacitor. This coupled with a circuit(More)
A modified-Volterra-series (MVS) approach for improving the accuracy of the harmonic balance method in coupled device and circuit simulation is presented. This approach is compared with a previous quasi-static implementation for accuracy and performance. The new technique significantly improves accuracy over the quasi-static approach for high frequency,(More)
This paper examines three algorithmic approaches for the frequency-domain harmonic-balance method in a coupled device and circuit simulator. These are the nonquasi-static, quasi-static, and modified Volterra series approaches. A detailed qualitative and quantitative comparison between these approaches is provided in terms of accuracy and the computational(More)
A polymer-salt aqueous two-phase system (ATPS) consisting of thermosensitive copolymer ethylene-oxide-b-propylene-oxide-b-ethylene-oxide (EOPOEO) and NaH2PO4 was employed in deproteinization for lycium barbarum polysaccharide (LBP). The effects of salt type and concentration, EOPOEO concentration, amount of crude LBP solution and temperature were studied.(More)
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