The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a temperature digital control system for performance evaluation of electronic devices under different operating temperatures. The system is based on a thermoelectric module of Peltier effect, which is used for heating or cooling the device under test (DUT). A digital PI controller is designed through simulations with an electric model of the structure, developed in Simulink®. Based...
This paper exposes a fuzzy control to determine independent parameters of a passive circuit in order to obtain a desired output established by the design requirements. This is achieved using a vector representation of the circuit and varying the independent parameters by a fuzzy control based on three inference rules according to the output voltage. An analysis about the behavior of the control is...
Globally Asynchronous, Locally Synchronous (GALS) systems are widely used in medical applications. Typically, they exhibit high number of node-to-node communication channels that must transmit high data volume at high data rates and maintain data time coherence. The purpose of this paper is to present two structures for restoring data coherence in node-to-node communication, which may be lost due...
This paper proposes a new image interpolation technique by using direction-aware transform. In literature, it is known that Cosine-Sine modulated filter banks (CSMFB) can be regarded as alternative dual-tree complex wavelet transform, therefore, CSMFB has rich directional selectivity. Our interpolation procedure consists of two stages. First, we generate low frequency image and six directional images...
Online learning is a machine learning paradigm that is useful when data is not available all at once. In this paper we focus in real time applications for which data is being collected as the algorithm executes. The forgetron Algorithm [1] is an online learning algorithm that works under a limited memory constraint while guaranteeing a bound on the number of total mistakes. We have proposed a specific...
A 12.5 GS/s 5-bit A/D converter is described. The architecture is a hybrid scheme with flash, single and double folding, able to obtain the optimum trade off between speed and power consumption. Simulations at the transistor level validate the proposed architecture.
This paper presents a continuous-time 8-bit folding analog-to-digital converter. The clock-less architecture is composed of 8 identical stages with 1 bit/stage. The circuit is designed in a 350nm CMOS process with a supply voltage of 3.3V. Simulation results show that the 8-bit clock-less ADC can achieve a Signal-to-Noise and Distortion Ratio of 53dB. The ADC has a power consumption of 5.51mW. The...
This paper proposes an area-efficient coarse-fine resistor-string digital-to-analog converter (DAC). It reduces the number of the unit resistors and switches in the resistor-string DAC by dividing the resistor-string into coarse and fine resistor-strings. It makes the analog output by summing two voltages generated in the coarse and fine resistor-strings. A bias current flows through the series-connected...
Mismatch shaping is a commonly used technique for shaping the noise created by mismatch errors in over-sampled digital-to-analog converters. Mismatch shaping techniques reported thus far operate with the signal band located at a fixed frequency. This paper presents a simple architecture for arbitrarily tuning the center frequency of a first-order mismatch shaping transfer function. Details of hardware...
This paper proposes a unified design methodology for ZCT and ZCZVT inverters presented in literature. It is based on the intrinsic dynamic restriction of the IGBT technology under Zero Current and Zero Voltage switching conditions. This way, the same switching conditions may be ensured for IGBT modules that employ ZCT and ZCZVT auxiliary circuits. It is very important to access the real benefits of...
This paper proposes a tuning method for a linear quadratic regulator (LQR) and its application to Uninterruptible Power Supplies (UPS). A performance index is established based on the desired behavior of system variables, such as maximum values permitted on the states and control law saturation. The tuning method is based on the Q and R weighting matrices, which relate the energy of the state variables...
Much work have been done lately to develop complex motor control systems. However they always rely on a physical drive/motor/encoder setup for experimental results. This paper presents a hardware DC motor emulator that can be synthesized to FPGAs. The emulator is intended to replace an actual DC motor during the development phase of motor controllers. A torque based input is required and incremental...
The implementation of high quality complex wireless sensor networks requires a good level of flexibility both at compile-time (configuration) and at run-time (management). The twofold goal is on one hand to improve the overall “fitness” of the application implemented to the changing environment and on the other hand to limit the footprint of the software. This paper presents a flexible and lightweight...
MultiBand OFDM (MB-OFDM) is a short-range wireless technology that permits data transfers at very high rates, between 53.3 and 480 Mbps. MB-OFDM uses the already licensed radio spectrum, between 3.1 GHz – 10.6 GHz, in an unlicensed manner, i.e. without a licensing cost or control. MB-OFDM divides the spectrum allocated to UWB into 14 bands of 528 MHz. Each OFDM symbol is transmitted across a band...
A novel LNA with integrated notch filter for multi-band, multi-standard cellular communication is presented in this paper. The LNA is capable to serve multiple FDD bands of the LTE standard and its cobanded UMTS counterparts. Due to its architecture also TDD bands including GSM bands DCS1900 and PCS1800 and LTE TDD bands can be covered. Due to the integrated notch filter which is reused for all covered...
This paper presents a 65nm CMOS-power amplifier (PA) designed for WiFi communications. The PA is based on a Half Stacked Folded Differential Structure (HSFDS) cascoded. The PA is designed for the WiFi 802.11n standard. The power amplifier provides 24.5 dBm output powers with 25% of power added efficiency (PAE) at 2.45 GHz. The linear gain is 15.5 dB and the compression point (OCP1) is 18.5 dBm. In...
A millimeter-wave PA (Power Amplifier) based on a 65nm CMOS technology from STMicroelectronics has been designed. It is optimized to deliver the maximum OCP1 (Output Compression Point) equal to 12dBm. The targeted feature is the unlicensed band around 60GHz suitable for Wireless Personal Area Network application (WPAN). Considering that constraints, one-tone simulations are not sufficient to characterize...
CMOS downscaling and recent advances in Single-Electron devices — such as Single-Electron Transistors (SET), foreseen the combination of both devices in hybrid systems. Despite the current problems in manufacturing single-electron structures, there is an increasing need for improving the design-path of these systems by tackling several aspects, among them, device modelling for hybrid simulation. This...
Arithmetic computation decomposition is a powerful strategy used to solve large and complicated computing problems. In this paper, efficient design methodologies and systematic approaches for realizing large size signed multipliers are presented based on the use of small-size embedded blocks in FPGAs. To demonstrate the effectiveness of our approach, two large size operand computations are realized...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.