Physical activity monitoring devices, such as accelerometers, are useful aids to athletes and those exercising to lose weight. However, such devices cannot monitor rest energy expenditures, which is over 75% of daily energy usage. For those seeking to lose weight and especially those who cannot exercise, there is a need for a device that can accurately...

For mobile devices, reducing power draw and prolonging battery life are critical design objectives. Presently, current-steering digital to analog converters (DACs) require high power consumption and dynamic element matching and are vulnerable to component source mismatch. Accordingly, large rail devices and higher supply voltages are needed. Additionally,...

As a result of inefficiency, radio frequency (RF) power amplifiers typically consume high levels of current. Consequently, there have been numerous attempts to use external circuitry in order to improve the efficiency of RF power amplifiers located on integrated circuits (ICs); however, these attempts have failed to provide the desired improvements...

In many electronics applications various blocks of components on the integrated circuit may have optimal power consumption at different operational voltages. Power optimization and low power requirements are getting even more critical in wireless applications. Several low power schemes are in use today. In some mobile applications, minimizing power...