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We describe a hierarchical structure for a knowledge-based analog circuit synthesis tool. Analog circuit topologies are represented as a hierarchy of abstract functional blocks each with associated design knowledge. We also describe mechanisms to select from among alternate design styles, and to translate performance specifications from one level in the(More)
This paper presents a technique to efficiently supply power over a wide power range using a fully integrated on-chip converter for dynamic voltage scaling (DVS) based applications. All components, including filter elements, are integrated onchip. To achieve high efficiency the converter adaptively switches between different modes of operation by detecting(More)
This paper presents a wide tuning range LC voltage controlled oscillator with a new differential negative resistance cell that uses capacitive source degeneration. Traditional differential negative resistance cell use two transistors where the drains are cross-connected to the corresponding gates and the sources are ac grounded. This structure has a fairly(More)
Ultra-wideband communications systems offer unique challenges and opportunities for RF circuit design. Proper understanding of the trade-offs that system specifications impose upon the circuit designer is essential in optimizing a system for UWB. The defining attribute of UWB is the wide fractional bandwidth of the signal. This wide bandwidth can be(More)
— This paper presents a low power impulse generator design for ultra-wideband (UWB) impulse radio (IR) applications. Simple digital delay elements and a NAND gate are used to generate short duration pulses. A varactor controls the pulse width of the generated signal. The low-end of the spectrum of the generated pulse is attenuated using an integrated(More)