Zobrazeno 1 - 10
of 244
pro vyhledávání: '"Callegari, Sergio"'
Publikováno v:
Proceedings of the 7th International Conference Mixed Design of Integrated Circuits and Systems (MIXDES 2000), Gdynia, Poland, Jun. 2000, pp. 139-144
An interleaving technique is proposed to enhance the throughput of current-mode CMOS discrete time chaotic sources based on the iteration of unidimensional maps. A discussion of the reasons and the advantages offered by the approach is provided, toge
Externí odkaz:
http://arxiv.org/abs/1507.00196
Publikováno v:
Proc. of ECCTD'99, vol. 1, Stresa, IT, Sep. 1999, pp. 193-196
In the implementation of discrete time chaotic systems, designers have mostly focused on the choice and synthesis of suitable nonlinear blocks, while correct and fast operation cannot neglect analog memory elements. Herein, a realization exploiting t
Externí odkaz:
http://arxiv.org/abs/1506.08327
Autor:
Callegari, Sergio
Publikováno v:
Proceedings of the 2014 IEEE International Symposium on Circuits and Systems (ISCAS), pp. 2776-2779, Jun. 2014
Spread-spectrum signals are increasingly adopted in fields including communications, testing of electronic systems, Electro-Magnetic Compatibility (EMC) enhancement, ultrasonic non-destructive testing. This paper considers the synthesis of constant-e
Externí odkaz:
http://arxiv.org/abs/1412.6357
Autor:
Fabbri, Mattia, Callegari, Sergio
Good quality entropy sources are indispensable in most modern cryptographic protocols. Unfortunately, many currently deployed networked devices do not include them and may be vulnerable to Random Number Generator (RNG) attacks. Since most of these sy
Externí odkaz:
http://arxiv.org/abs/1412.6067
Autor:
Callegari, Sergio
Publikováno v:
IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS 2013), pp. 589-592, Dec. 2013
The possibility of using a single digital {\Delta}{\Sigma} modulator to simultaneously encode the two channels of a stereo signal is illustrated. From the modulated stream, the two channels can be recovered with minimal processing and no cross-talk.
Externí odkaz:
http://arxiv.org/abs/1409.7367
Autor:
Callegari, Sergio, Ricci, Marco, Caporale, Salvatore, Monticelli, Marcello, Eroli, Massimiliano, Senni, Luca, Rovatti, Riccardo, Setti, Gianluca, Burrascano, Pietro
Publikováno v:
IEEE International Ultrasonics Symposium (IUS), 2012 pp.471-474, 7-10 Oct. 2012
Pulse compression is often practiced in ultrasound Non Destructive Testing (NDT) systems using chirps. However, chirps are inadequate for setups where multiple probes need to operate concurrently in Multiple Input Multiple Output (MIMO) arrangements.
Externí odkaz:
http://arxiv.org/abs/1310.6593
Autor:
Callegari, Sergio, Rovatti, Riccardo
Publikováno v:
Proceedings of the 1998 International Symposium on Nonlinear Theory and its Applications (NOLTA), vol. 1, pp. 199-202, Crans Montana (CH), Sept. 1998
Though considerable effort has recently been devoted to hardware realization of chaotic maps, the analysis generally neglects the influence of implementation inaccuracies. Here we investigate the consequences of S/H errors on Bernoulli shift, tent ma
Externí odkaz:
http://arxiv.org/abs/1310.4700
Autor:
Callegari, Sergio, Bizzarri, Federico
A design flow for {\Delta}{\Sigma} modulators is illustrated, allowing quantization noise to be shaped according to an arbitrary weighting profile. Being based on FIR NTFs, possibly with high order, the flow is best suited for digital architectures.
Externí odkaz:
http://arxiv.org/abs/1309.6151
Autor:
Callegari, Sergio, Bizzarri, Federico
Publikováno v:
Proceeding of the 19th IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2012, pp. 849-852
We consider the use of {\Delta}{\Sigma} modulators in ac motor drives, focusing on the many additional degrees of freedom that this option offers over Pulse Width Modulation (PWM). Following some recent results, we show that it is possible to fully a
Externí odkaz:
http://arxiv.org/abs/1302.7172
Autor:
Callegari, Sergio, Bizzarri, Federico
Publikováno v:
IEEE Transactions on Circuits and Systems - Part I, Regular Papers. Vol. 60, N. 9, pp 2352 - 2365, Sept. 2013
The Noise Transfer Function (NTF) of {\Delta}{\Sigma} modulators is typically designed after the features of the input signal. We suggest that in many applications, and notably those involving D/D and D/A conversion or actuation, the NTF should inste
Externí odkaz:
http://arxiv.org/abs/1302.3020