VHDL-AMS behavioral modeling and simulation of a Π/4 DQPSK transceiver system

Roch

2008

J Electron Test

One of the most challenging tasks while designing an automotive electronic device is to take into account its whole electro-mechanic environment, so that time expensive failure tests can be reduced. We show a case study, developed in collaboration with an industrial partner, in which an automotive Compact Disk (CD) player is modelled. Using VHDL-AMS, not only its whole mixed-signal electro-mechanic structure, but the car one, the road profile and the audio input have been described as well. A set of fault analyses have been performed, too, using the developed model. Results demonstrate the feasibility of the methodology both as a substitute of traditional fault analyses, and as a method to inspect the failure causes. Besides, this approach allows to hilight, during the design phase, the key points to optimize the target device, taking into account its real application environment. As an example, our system is able to reliably predict reading errors due to road profile variations.

Section: Vhdl-ams: a Multidisciplinary Language For Multi-resolution mentioning

confidence: 77%

An Automotive CD-Player Electro-Mechanics Fault Simulation Using VHDL-AMS

Roch

2008

J Electron Test

“…Basic functionality tests using a behavioral VHDL-AMS description were used in [20] showing the feasibility of a full transceiver circuit simulation in which a realistic communication channel is emulated. In [21], RF blocks of a differential quadrature phase-shift keying (DQPSK) transceiver and a channel model were implemented adding white Gaussian noise in a behavioral VHDL-AMS description and achieving BER results very close to theoretical models. Other works demonstrate the possibility to annotate transistor-level simulation results or silicon prototype measurements back to the behavioral VHDL-AMS circuit model.…”

Section: B Vhdl-amsmentioning

confidence: 99%

A VHDL-AMS Simulation Environment for an UWB Impulse Radio Transceiver

Casu

Crepaldi

IEEE Trans. Circuits Syst. I

2008

Ultra-wide-band (UWB) communication based on the impulse radio paradigm is becoming increasingly popular. According to the IEEE 802.15 WPAN Low Rate Alternative PHY Task Group 4a, UWB will play a major role in localization applications, due to the high time resolution of UWB signals which allow accurate indirect measurements of distance between transceivers. Key for the successful implementation of UWB transceivers is the level of integration that will be reached, for which a simulation environment that helps take appropriate design decisions is crucial. Owing to this motivation, in this paper we propose a multiresolution UWB simulation environment based on the VHDL-AMS hardware description language, along with a proper methodology which helps tackle the complexity of designing a mixed-signal UWB system-on-chip. We applied the methodology and used the simulation environment for the specification and design of an UWB transceiver based on the energy detection principle. As a by-product, simulation results show the effectiveness of UWB in the so-called ranging application, that is the accurate evaluation of the distance between a couple of transceivers using the two-way-ranging method. Index Terms-Mixed-signal integrated circuits, ultra-wide-band (UWB) communications, VHDL-AMS. I. INTRODUCTION A CCORDING to the definition of the Federal Communications Commission (FCC) an ultra-wide-band (UWB) signal is characterized by a bandwidth of minimum 500 MHz or by a fractional bandwidth of at least 20%, regardless of the type of modulation or system of transmission [1]. In 2002, FCC released the spectrum between 3.1 and 10.6 GHz for unlicensed use with UWB signals, provided that severe average and peak power constraints are respected. The broad UWB definition and the large free spectrum led to many different proposals of more or less conventional modulation strategies [like wide-band orthogonal frequency-division multiplexing (OFDM) and code-division multiple access (CDMA)], which are envisaged for applications like wireless personal area networks (WPANs), (see, for example, the former work of the IEEE 802.15 WPAN High Rate Alternative PHY Task Group 3a [2] and of the current WiMedia Alliance [3]). However, UWB is more commonly referred to as a "baseband" or "impulse-based" communication technology, because one of the possibility to exploit such a large bandwidth is to directly send fast rise-time and short duration carrier-free pulses to a wide-band antenna. This is certainly not new because the origins root back to the

“…In [14], basic functionality tests using an abstract VHDL-AMS behavioral description were used for a full transceiver circuit simulation without the inclusion of RF blocks. In [15], RF blocks of a DQPSK transceiver and a channel model are implemented adding white gaussian noise, achieving BER results very close to theoretical models. Jitter has been introduced in [16] for modeling the real behavior of a PLL using VHDL-AMS: The phase noise simulated spectrum was in good agreement with the measured results.…”

Section: Using Vhdl-ams For a Flexible Design Proceduresmentioning

confidence: 68%

“…Then we implemented in VHDL-AMS the receiver shown in figure 1. The gaussian noise was created like in [15] while the channel model was the same used for the Matlab simulation. For the BER analysis we supposed perfect timing acquisition (ideal synchronizer).…”

Section: Comparison Between Matlab and Vhdl-amsmentioning

confidence: 99%

Energy detection UWB receiver design using a multi-resolution VHDL-AMS description

Crepaldi

Casu

IEEE Workshop on Signal Processing Systems Design and Implementation, 2005.

Ultra Wide Band (UWB) impulse radio systems are appealing for location-aware applications. There is a growing interest in the design of UWB transceivers with reduced complexity and power consumption. Non-coherent approaches for the design of the receiver based on energy detection schemes seem suitable to this aim and have been adopted in the project the preliminary results of which are reported in this paper. The objective is the design of a UWB receiver with a top-down methodology, starting from Matlab-like models and refining the description down to the final transistor level. This goal will be achieved with an integrated use of VHDL for the digital blocks and VHDL-AMS for the mixed-signal and analog circuits. Coherent results are obtained using VHDL-AMS and Matlab. However, the CPU time cost strongly depends on the description used in the VHDL-AMS models. In order to show the functionality of the UWB architecture, the receiver most critical functions are simulated showing results in good agreement with the expectations.