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A low cost integrated reconfigurable power amplifier (PA), dedicated to multi-mode, multi-standard radio frequency front-end (RFFE), is proposed. Power considerations are taken into account in the design through the use of emitter ballasted HBT's and special care on the layout. The reconfigurable amplifier topology is presented, made up of two-stages independently controllable by biasing scheme. It...
A novel concept for global shutter CMOS image sensors with Wide Dynamic Range (WDR) implementation is presented. The proposed imager is based on the multi sampling WDR approach and it allows an efficient global shutter pixel implementation achieving small pixel size and high fill factor. The proposed imager provides wide DR by applying adaptive exposure time to each pixel, according to the local illumination...
Nowadays the temperature of bearings in high speed trains is determining their speed. It is necessary to know the value of this variable in each moment, in order to be able to prevent possible failures. Traditional solutions use wired systems which are quite reliable but very expensive. This paper describes a new way of carrying out this measurement using a wireless technology system based on the...
This paper presents a generalized and easy to use method based on Hill's equation to analyze the electromagnetic wave propagation in stratified dielectric or in inhomogeneous media with arbitrary permittivity profiles. The purpose of this study is to explore the effects of polarization, incidence angle, layers thickness, and permittivity profiles on reflection and transmission characteristics. Due...
A generation scheme to make a low noise low distortion PWM signal spreading its spectrum for the fully digital audio amplifier is proposed. The carrier frequency of the PWM is fluctuated randomly to spread the spectrum of the carrier component. The noise-shaping filter in the delta-sigma modulator is implemented so that the filter works with a changing sampling period preserving the designed frequency...
In the fathomable design of ultra low current mode circuit (UCMC), circuit for on-chip measurement and monitoring of pico-ampere current is in high demand, not only for its simplicity in structure and cheapness in price, but also for its high measure accuracy and process tolerance. In this paper, on-chip ultra low current measurement methodologies based on hazard free sawtooth oscillator whose average...
The design of a Gm-C filter for High-Frequency applications is described in this paper. A low-pass, sixth-order elliptic Gm-C filter based on the new biquadratic architecture in 0.18 um CMOS process is designed with the proper dynamic rang. A simple structure of the high Q biquadratic filter is used to enhance the linearity and tunability of the filter. The cut off frequency of this filter is 33 MHz...
In this paper, a frequency-path model for three-longitudinal-mode interferometer (TLMI) is presented. The model describes two main error sources that affect the accuracy of displacement in heterodyne interferometers. Unwanted leakage between the reference and the target paths and inter-modulation error due to the nonlinearity of current to voltage converter, double balanced mixer, and pre-amplifier...
This paper presents a new design method for IIR notch filters with improved performance while operating with a limited number of samples. The design criterion is to minimize the error between the steady state and transient frequency responses while utilizing the initialization technique. The new filters which use multiple frequency initialization offer better transient frequency responses than conventional...
This paper presents a compensation structure to reduce the output common mode current of a rail-to-rail constant gm transconductance stage. The transconductance stage is a differential structure with the input transistors biased in weak inversion. This results in low power consumption and a simple relation between gm and tail currents. The constant gm is achieved by doubling the tail current in...
For microwave applications, there is a great demand for frequency tunable devices. Most of the time, these devices are obtained by including discrete components in the structures. We propose here to use a ferroelectric material with weak losses. It will be associated with frequency selective surfaces and photonic crystals. The application of an electric field to this structure, allows obtaining a...
A low noise amplifier designed in a 0.13 mum CMOS VLSI technology is presented, which has self-test capabilities in order to monitor its behavior within a ZigBee sensor network during its life time. The silicon area required for both the built-in self test circuitry and the LNA has been optimized in order to reduce the overall cost of the function, using a shunt-feedback topology. The LNA provides...
In this communication a simple technique based on the phasor's method is presented in order to analytically deal with nearly sinusoidal oscillator constraints. Unlike other methods, more complex from a computational point of view, such as Volterra series and Poincare's perturbation, we are able to set the main linearity performance of a weakly nonlinear oscillator through closed form relationships...
This paper presents the design of a low phase noise 1.6 GHz CMOS buffered quadrature output VCO with automatic amplitude control. It is operated with a supply voltage of 1.2 V and dissipates a current of less than 10 mA. It is capable of delivering quadrature locked signals with almost constant amplitude in the range from 1.22 GHz to 1.95 GHz with a phase noise response of less than -115 dBc at an...
The manuscript discusses the design of an integrated DC-DC power converter in digital 0.18 mum CMOS technology for fuel cells and portable applications. By means of a combined boost and switched-capacitor architecture and design optimization a suitable efficiency has been achieved without resorting to special process options and with a limited number of passive external components. The achieved results...
This paper presents the design of a JPEG compressor for color images targeting high performance in a low cost FPGA device. The JPEG compressor architecture achieves high throughput with a deep and optimized pipeline and with a multiplierless datapath architecture. The architecture was synthesized to Altera FPGAs and the synthesis results and relevant performance comparisons with related works are...
High linear voltage reference circuitry is designed and implemented in TSMC 0.13 mum and 0.18 mum CMOS technology. Previous research has proposed the use of MOS transistors operating in the weak inversion region to replace the bipolar devices in conventional PTAT (proportional to absolute temperature) circuits. However, such solutions often have linearity problem in high temperature region due to...
This paper introduces a design methodology for a current-reuse wideband CMOS low noise amplifier (LNA). A theoretic analysis of source degeneration current-reuse CMOS LNAs is presented. The advantages and limitations of wideband amplification using this kind of LNA are analyzed. The theoretical results are validated through comparison to simulations using BSIM3v3 models of a 0.81 um CMOS process....
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