Glitch

About: Glitch is a research topic. Over the lifetime, 1094 publications have been published within this topic receiving 10188 citations. The topic is also known as: video game glitch.

A 12-bit intrinsic accuracy high-speed CMOS DAC

Abstract: A 12-bit intrinsic accuracy digital-to-analog (D/A) converter integrated in a standard digital 0.5 /spl mu/m CMOS technology is presented. It is based on a current steering doubly segmented 6+2+4 architecture and requires no calibration, no trimming, or dynamic averaging. The differential nonlinearity (DNL) and integral nonlinearity (INL) are 0.3 and 0.6 least significant bits (LSB's), respectively. The measured glitch energy is 1.9 pV.s. For a 12-bit resolution, the converter reaches an update rate of 300 MS/s. By reducing the voltage supply of the latches to 2.0 V, the glitch energy is reduced to sub-pV.s, and the update rate reaches 500 MS/s, for a resolution of 8 bits. The worst case power consumption is 320 mW, and it operates from a single 3.3 V voltage supply. The die area is 3.2 mm/sup 2/.

A cross-layer design for scalable mobile video

Abstract: Today's mobile video suffers from two limitations: 1) it cannot reduce bandwidth consumption by leveraging wireless broadcast to multicast popular content to interested receivers, and 2) it lacks robustness to wireless interference and errors. This paper presents SoftCast, a cross-layer design for mobile video that addresses both limitations. To do so, SoftCast changes the network stack to act like a linear transform. As a result, the transmitted video signal becomes linearly related to the pixels' luminance. Thus, when noise perturbs the transmitted signal samples, the perturbation naturally translates into approximation in the original video pixels. This enables a video source to multicast a single stream that each receiver decodes to a video quality commensurate with its channel quality. It also increases robustness to interference and errors which now reduce the sharpness of the received pixels but do not cause the video to glitch or stall. We have implemented SoftCast and evaluated it in a testbed of software radios. Our results show that it improves the average video quality for multicast users by 5.5dB, eliminates video glitches caused by mobility, and increases robustness to packet loss by an order of magnitude.

Electromagnetic Fault Injection: Towards a Fault Model on a 32-bit Microcontroller

Abstract: Injection of transient faults as a way to attack cryptographic implementations has been largely studied in the last decade. Several attacks that use electromagnetic fault injection against hardware or software architectures have already been presented. On micro controllers, electromagnetic fault injection has mostly been seen as a way to skip assembly instructions or subroutine calls. However, to the best of our knowledge, no precise study about the impact of an electromagnetic glitch fault injection on a micro controller has been proposed yet. The aim of this paper is twofold: providing a more in-depth study of the effects of electromagnetic glitch fault injection on a state-of-the-art micro controller and building an associated register-transfer level fault model.

The glitch-induced identity changes of PSR J1119−6127

Abstract: Rotation-powered radio pulsars are generally observed to pulse regularly in the radio band, but this is not the case for so-called rotating radio transients (RRATs) which emit only sporadic bursts of radio emission. We demonstrate that the high-magnetic field pulsar J1119−6127 exhibits three different types of behaviour in the radio band. Trailing the ‘normal’ profile peak there is an ‘intermittent’ peak and these components are flanked by two additional components showing very erratic ‘RRAT-like’ emission. Both the intermittent and RRAT-like events are extremely rare and are preceded by a large amplitude glitch in the spin-down parameters. The post-glitch relaxation occurs on two different time-scales (∼20 and ∼210 d) and the post-glitch spin-down rate is smaller than the pre-glitch rate. This type of relaxation is also seen in an earlier, smaller glitch and is very unusual for the pulsar population as a whole, but is observed in the glitch recovery of an RRAT. The abnormal emission behaviour in PSR J1119−6127 was observed up to three months after the epoch of the large glitch, suggestive of changes in the magnetospheric conditions during the fast part of the recovery process. We argue that both the anomalous recoveries and the emission changes could be related to reconfigurations of the magnetic field. Apart from the glitches, the spin-down of PSR J1119−6127 is relatively stable, allowing us to refine the measurement of the braking index (n= 2.684 ± 0.002) using more than 12 yr of timing data. The properties of this pulsar are discussed in light of the growing evidence that RRATs do not form a distinct class of pulsar, but rather are a combination of different extreme emission types seen in other neutron stars. Different sub-classes of the RRATs can potentially be separated by calculating the lower limit on the modulation index of their emission. Unlike other quantities, this parameter is independent of observation duration allowing a direct comparison with other emission phenomena. We speculate that if the abnormal behaviour in PSR J1119−6127 is indeed glitch induced then there might exist a population of neutron stars which only become visible in the radio band for a short duration in the immediate aftermath of glitch activity. These neutron stars will be visible in the radio band as sources that only emit a cluster of pulses once every few years.

The glitch PUF: a new delay-PUF architecture exploiting glitch shapes

Abstract: In this paper we propose a new Delay-PUF architecture that is expected to solve the current problem of Delay-PUF that it is easy to predict the relation between delay information and generated information. Our architecture exploits glitches that behave non-linearly from delay variation between gates and the characteristic of pulse propagation of each gate. We call this architecture Glitch PUF. In this paper, we present a concrete structure of Glitch PUF. We then show the evaluation results on the randomness and statistical properties of Glitch PUF. In addition, we present a simple scheme to evaluate Delay-PUFs by simulation at the design stage. We show the consistency of the evaluation results for real chips and those by simulation for Glitch PUF.