A design strategy for a rail-to-rail input / output operational amplifier in standard CMOS 0.18 μm digital process with a 0.5-V threshold is presented. It uses a novel level shifting technique of the input signal and a dynamically biased class AB output stage based on a switched-capacitor configuration. The amplifier is capable of working with a power supply as low as 1-V while providing a 26.6...

Beyond the primitive transistor, the operational amplifier (op amp) is the most basic building block for analog applications. Fundamental functions such as gain, load isolation, signal inversion, level shifting, adding and/or subtracting signals are easily implemented with an op amp. More complex circuits can also be implemented, such as the instrumentation amplifier, a current-to-voltage conve...

Abstract: A pilot sequence design for MIMO-OFDM systems is investigated where all transmit antennas share the same sub-carriers to convey pilot symbols. The pilot sequences are endowed with phase-shifting properties, granting the receiver the possibility of extracting the impulse responses for all channels directly from the antennas’ time-domain received signals, without co-channel interference...

This paper presents the design of a middleware approach that aims at assisting handheld devices in accessing Grid services by wrapping the computational and resource intensive tasks in a surrogate and shifting them to a capable machine for execution. The performance of the surrogate approach is evaluated with the help of a test scenario. The reduction in computational intensity at the handheld ...

This paper describes the optimization techniques for interaction of constrained handheld devices with Grid services by employing the concepts of Jini Surrogate Architecture. Handheld devices in general do not posses enough computational and communicational assets to meet the criteria for utilizing the Grid infrastructure services. We present the design of a middleware approach that aids handhel...

This paper presents a multilevel converter with regeneration capability. The converter uses several power cells connected in series, each working with reduced voltage and with an active front end at the line side. This paper presents the following: 1) the control method of each cell; 2) the use of phase-shifting techniques to reduce the current and voltage distortion; and 3) criteria to select ...

Digital power is one of the most important technologies available today to reduce power consumption and also manage the growing power complexity in modern electronic systems in information and communications technology markets and in today’s smart handheld or portable consumer electronics products. Digital power management and control provide real-time intelligence that enables system developer...

Introduction: The development of designs for test techniques continue to receive a great deal of consideration [l]. Techniques based on scan is one of the most effective methodologies and has been adopted widely in the area of digital integrated circuit design. When testing systems with scan design, the entire scan registers (SRs) andor combinational modules are always active during the whole s...

In this paper we present a new circuit design for a 2.4GHz CMOS direct conversion mixer incorporating adaptive offset cancellation. The basic circuit structure is that of a Gilbert cell mixer. Offsets are cancelled by dynamically varying the bias on the loads, which are designed to provide constant impedance independent of the load cancellation current. The bias control is regulated via an adap...