Introduction: Recent reports in exercise related bone research have shown increased bone mineral content (BMC) at the femoral neck for prepubescent children participating in exercise programs consisting of repeated drop landings from a height of 61 cm. Increases in BMC from this type of exercise are believed to be the...
As the information-processing and telecommunications revolutions now underway
will continue to change our life styles in the rest of the 21st century, our
personal and economic lives rely more and more on our ability to transact over
the electronic medium in a secure way. The privacy, authenticity, and integrity of...
High-accuracy and high-speed CMOS track-and-hold (T/H) or sample-and-hold (S/H) circuits are an important part of the analog-to-digital interface. The switched-capacitor (SC) circuits usually contain one or more op-amps whose dc offset, finite gain, finite bandwidth have a big impact on the accuracy of the track-and-hold circuit. Basic correlated double sampling...
It has been verified by theoretical analysis, circuit simulation and test that two
switch transistors in parallel in a simple sample and hold circuit can be achieve high speed
with low error voltage due to charge injection. The wide transistor provides low RC time
constant when it is closed and...
The thesis presents a new algorithm and structure that is to be used in conjunction
with a specially modified CMOS Gilbert cell mixer to remove time-varying DC offsets
in direct conversion receivers. In our approach, the DC offset is detected at the output
of the mixer using a dedicated coarse...
The recent demand for wireless transceivers has created a flurry of research into nontraditional
receiver architectures. The homodyne receiver, because of its high degree of
integration, low complexity and low power consumption, has surfaced a desirable alternative
to the well-known heterodyne receiver. However, distortions such as gain and phase
In recent years, there has been an extensive effort to develop low-cost implementations
of radio frequency integrated circuits for consumer applications. This thesis is a
research effort in the design and implementation of integrated RF CMOS Power Amplifiers
(PAs). A significant challenge in the implementation of RF CMOS ICs is...
Interference from other adjacent users in wireless applications is a major problem
in direct-sequence code-division multiple-access (DS-CDMA). This is also known as the
near-far problem where a strong signal from one user interferes with other users. The
current approach to deal with the near-far problem in DS-CDMA systems is to...