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The switching audio amplifiers are widely used in various portable and consumer electronics due to their high efficiency, but suffers from low audio performances due to inherent nonlinearity. This paper presents an integrated class D audio amplifier with low consumption and high audio performances. It includes a power stage and an efficient control based on sliding mode technique. This monolithic...
SystemC is emerging as a de-facto standard for digital system design. Since embedded systems include more and more heterogeneous components (e.g., analog/RF front-ends, processor cores, embedded software, digital hardware, sensors, actuators), the need for also supporting continuous-time models of computation in SystemC is growing. This paper reviews the main efforts to date for augmenting SystemC...
A methodology for the simulation of bandpass continuous time sigma-delta (SigmaDelta) modulators is presented in this paper. This method permits the simulation of SigmaDelta modulators employing continuous-time filters using a fixed-step algorithm. The method is based on the discretization of a continuous-time model and the use of a discrete simulator, which is more efficient than an analog simulator...
Polyphase filters are an efficient solution for high image rejection and great accuracy quadrature generation in radio frequency (RF) receivers. Analytical modeling of passive polyphase filter suitable for RF front-end applications operating in 2.4 GHz frequency band is dealt with. This analytical analysis has been used to calibrate the optimal values of passive components in order to obtain the maximum...
This paper analyzes the effect of inherent bipolar transistor parasitic elements on the computing nodes performance used in BJT analog decoders. It is shown that these undesirable effects significantly degrade, up to 85%, the conversion of Log-Likelihood Ratios into probabilities. This can lead to a wrong decoding outcome when complex computing nodes are designed. Simulation results are shown for...
This paper investigates the radiofrequency failure mechanisms of power amplifier (PA) integrated in an HBT technology, and proposes a circuit solution for PA protection against impedance mismatches. It exposes the failure mechanisms that occur when a PA under extreme conditions (high battery voltage and high input power) is exposed to impedance mismatches at its output. Protection against high voltage...
In this paper, we propose a class of adaptive low-density parity-check (LDPC) codes for reliable data transmission in wireless networks, i.e. the code rate can be adapted according to channel conditions to maximize the total capacity. Constructed from shifted identity matrices, the first advantage of the proposed codes is that these codes are particularly well-suitable for the high-speed implementation...
This paper proposes an efficient design methodology for implementing a large-size signed multiplier using multi-granular embedded blocks. A 256times256-bit 2psilas complement multiplier is implemented based on 18times18-bit and 36times36-bit embedded multipliers. The use of the multiple-size embedded blocks with a new sign-extension scheme efficiently simplifies the addition of the partial products,...
A 65 nm CMOS, 60 GHz fully integrated power amplifier (PA) from STMicroelectronics has been designed for low cost Wireless Personal Area Network (WPAN). It has been optimized to deliver the maximum linear output power (OCP1) without using parallel amplification topology. The simulated OCP1 is equal to 8.9 dBm with a gain of 8 dB. To obtain good performances and consume an ultra compact area of silicon,...
MEMS integration into standard design flows is still an open topic after several years of research and investigations. Facing the diversity of CAD tools, modeling languages and associated simulators, the choice of a particular design flow seems to be a matter of culture. The work presented demonstrates how, in a microelectronic environment, it is possible to focus on system level simulation taking...
During the development of a VLSI (Very Large Scale Integration) circuits; their internal stress due to packaging combined with local self heating becomes serious and may result in large performance variation, circuit malfunction and even chip cracking. Surface peaks thermal detection is necessary in large VLSI circuits. This paper presents a VLSI circuit thermal stress monitoring approach using surface...
In the case of spinal cord injurie, Functional Electrical Stimulation, which creates artificial muscle contractions by electrical stimulation, has proven to be capable of helping to restore impaired biological functions. Sensory information from natural sensors going through afferent nervous fibers could be used as feedback information in a closed-loop FES system. In order to get this information,...
A new adaptation scheme for low noise and fast settling 50 MHz analog phase-locked loop (PLL) is presented. According to the locking status, an extended loop bandwidth enhancement is achieved by the adaptive control on the charge pump current . First of all, when the phase error is large, such as in the locking mode, the PLL increases the loop bandwidth and achieves fast locking. On the other hand,...
Many existing and future systems are and will be composed by several significantly heterogeneous modules, including both continuous and discrete components. This broad class of systems includes analog/mixed-signal systems composed of RF, analog, analog-to-digital and digital-to-analog conversions, and recently, a large number of mixed-signal chips where at least part of the chip design needs to measure...
A harvesting microsystem is a heterogeneous component that is to say with at least one element none strictly electric. Several key points have to be taken into account to achieve a design of this kind of system: software-hardware partitioning, multi-physics simulation, 3D integration. This article introduces a top down methodology from specifications to layout. After a focus on specificities and needs...
Frequency-band-decomposition (FBD) is a good candidate to increase the bandwidths of ADC converters based on sigma-delta modulators. Each modulator processes a part of the input signal band and is followed by a digital filter. In the case of large mismatches in the analog modulators, a new solution, called extended frequency-band-decomposition (EFBD) can be used. This solution allows for, for example,...
Body sensor network (BSN) is a wireless network of implantable and/or wearable smart sensors. They can be deployed in medical applications, such as patients monitoring inside or outside hospital environment, as well as in high performance professional sports and other non human related applications. The size of a sensor node and its power consumption are major challenges in the design of implantable...
It is known that fast, fully combinational leading-digit detector circuits can be generated efficiently by recognizing their inherent hierarchical structure. It is shown herein that this structure is not only hierarchical, but also recursive. This recursivity fully defines a minimal-complexity circuit, thus guaranteeing optimal circuit synthesis. Such a circuit having an N-bit operand generates all...
This paper describes multithreading and interprocessor communication support in a dual-issue pipelined 32-bit processor for prototyping single-chip multiprocessors in programmable logic. Multithreading support includes multiple register contexts and instructions for thread management. Interprocessor communication support includes a ring network interface embedded in the pipelined datapath with instructions...
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