A number of oversampling filters in association with a heavily oversampled and noise-shaped digital-to-analog converter (DAC) are presented for high-resolution applications in professional and consumer digital audio environments. Computer simulations of oversampling filter, noise shaper, and DAC errors are described, together with results to demonstrate interactive performance dependence on fil...

A low-power ROM-less Direct Digital Frequency Synthesis (DDFS) system that exceeds the spectral purity of existing low-power DDFS systems by approximately is presented. The design applies an analogue voltage to the CMOS differential current switch in one cell of a non-linear DAC to interpolate between the output values which would be available from a conventional non-linear DAC.

A high energy-efficiency switching scheme for a successive approximation register (SAR) analogue-to-digital converter (ADC) is presented. The proposed method can achieve 98.4% savings in switching energy when compared to a conventional SAR. The proposed technique also achieves a 4 × reduction in total capacitance used in the digital-to-analogue converter (DAC) compared to the conventional DAC.

Furosemide attenuates hyperpnea-induced airway obstruction (HIAO) in asthmatic subjects via unknown mechanism(s). We studied the effect of furosemide on dry air-induced bronchoconstriction, mucosal injury, and bronchovascular hyperpermeability in a canine model of exercise-induced asthma. Peripheral airway resistance (Rp) was recorded before and after a 2-min dry-air challenge (DAC) at 2,000 ml...

The accuracy of a Digital to Analog Converter (DAC) is crucial for its operation. Due to production tolerances [1], the DAC static accuracy is limited, increasing the Integral Non-Linearity (INL). Traditionally, various calibration techniques are used to improve the INL [2]. In a Current Steering (CS) DAC, the output signal is generated by switchable current sources, the current cells, see Fig....

This work presents an 11 GS/s 1.1 GHz bandwidth interleaved ∆Σ DAC in 65 nm CMOS for the 60-GHz radio baseband. The high sample rate is achieved by using a two-channel interleaved MASH 1-1 architecture with a 4-bit output resulting in a predominantly digital DAC with only fifteen analog current cells. Two-channel interleaving allows the use of a single clock for the logic and the multiplexing w...

Distributed Adaptive Control (DAC) is a theory of the design principles underlying the Mind, Brain, Body Nexus (MBBN) that has been developed over the last 20 years. DAC assumes that the brain maintains stability between an embodied agent, its internal state and its environment through action. It postulates that in order to act, or know how, the brain has to answer 5 fundamental questions: who,...

A 10 bit current steering CMOS digital-to-analog converter (DAC) is designed, with optimized performance for frequency domain applications. To get the best of both binary-weighted and thermometer-coded architectures, most current-steering D/A converters are implemented using a segmented architecture. Segmentation is chosen to reduce the total area occupied by the DAC. The optimum segmentation f...

BACKGROUND A clinically driven transition in perfusion technique occurred at Children's Hospital and Medical Center, Omaha, Nebraska, from primarily selective cerebral perfusion bracketed by brief periods of deep hypothermic circulatory arrest to a technique of dual arterial perfusion including innominate artery and descending aortic cannulation (DAC), with continuous mildly hypothermic (>30 °C...