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In this work we consider the Colpitts oscillator as a paradigm for sinusoidal oscillation and we investigate its nonlinear dynamics. In particular, we carry out a two-parameter bifurcation analysis of a model of the oscillator. This analysis is conducted by combining numerical continuation techniques and normal form theory. First, we show that the birth of(More)
Access to the full text of the published version may require a subscription. Abstract—A MASH digital delta–sigma modulator (DDSM) is analyzed mathematically. It incorporates first-order error feedback modulators (EFM) which include prime modulus quantizers to guarantee a minimum sequence length. The purpose of this analysis is to calculate the exact(More)
— In a digital communications system, data is transmitted from one location to another by mapping bit sequences to symbols, and symbols to sample functions of analog waveforms. The analog waveform passes through a bandlimited (possibly time-varying) analog channel, where the signal is distorted and noise is added. In a conventional system the analog sample(More)
BACKGROUND Excessive first ray mobility has been implicated as the cause of many forefoot abnormalities. The association between hypermobility and forefoot pathology is controversial, and this is largely related to the difficulty in quantifying first ray motion. Manual examinations have been shown to be unreliable. Klaue etal. developed a device consisting(More)
BACKGROUND Coralline hydroxyapatite bone graft substitute material is created by the conversion of the calcium carbonate structure of coral into hydroxyapatite. The microstructure of the material resembles cancellous bone and provides an osteoconductive scaffold for bone ingrowth. The use of this material is reported in the orthopedic oncology and trauma(More)
Monolayer cultures of shark rectal gland (SRG) epithelial cells were treated with atriopeptin (AP), and the effects on Cl- secretion and intracellular guanosine 3',5'-cyclic monophosphate (cGMP) accumulation were examined. Basolateral or apical exposure to 10(-7) M AP markedly stimulated (8-fold) Cl(-)-dependent, bumetanide-sensitive, short-circuit current(More)
Access to the full text of the published version may require a subscription. Abstract—Two classes of techniques have been developed to whiten the quantization noise in digital delta–sigma modulators (DDSMs): deterministic and stochastic. In this two-part paper, a design methodology for reduced-complexity DDSMs is presented. The design methodology is based(More)