scholarly journals Worst-case circuit delay taking into account power supply variations

2004 ◽  
Author(s):  
Dionysios Kouroussis ◽  
Rubil Ahmadi ◽  
Farid N. Najm
Keyword(s):  
Power Supply ◽  
Worst Case ◽  
Circuit Delay

scholarly journals Managing contamination delay to improve Timing Speculation architectures

2016 ◽  
Vol 2 ◽  
pp. e79 ◽  
Author(s):  
Naga Durga Prasad Avirneni ◽  
Prem Kumar Ramesh ◽  
Arun K. Somani
Keyword(s):  
Performance Improvement ◽  
Short Path ◽  
Performance Enhancement ◽  
Propagation Delay ◽  
Performance Impact ◽  
Worst Case ◽  
Circuit Delay ◽  
Timing Speculation ◽  
Better Than

Timing Speculation (TS) is a widely known method for realizing better-than-worst-case systems. Aggressive clocking, realizable by TS, enable systems to operate beyond specified safe frequency limits to effectively exploit the data dependent circuit delay. However, the range of aggressive clocking for performance enhancement under TS is restricted by short paths. In this paper, we show that increasing the lengths of short paths of the circuit increases the effectiveness of TS, leading to performance improvement. Also, we propose an algorithm to efficiently add delay buffers to selected short paths while keeping down the area penalty. We present our algorithm results for ISCAS-85 suite and show that it is possible to increase the circuit contamination delay by up to 30% without affecting the propagation delay. We also explore the possibility of increasing short path delays further by relaxing the constraint on propagation delay and analyze the performance impact.

scholarly journals Radio Interference in Astronomical Observatories of China

2001 ◽  
Vol 196 ◽  
pp. 307-310
Author(s):  
B. Peng ◽  
R. Nan ◽  
T. Piao ◽  
D. Jiang ◽  
Y. Su ◽  
...  
Keyword(s):  
Mobile Phone ◽  
Radio Astronomy ◽  
Power Supply ◽  
Earthquake Activity ◽  
Radio Interference ◽  
Worst Case ◽  
Radar Systems ◽  
Astronomical Research ◽  
Interference Problems

We first very briefly introduce the major radio facilities for astronomical research in China, and then report on the present interference situation at major radio observatories. Some of the radio interference problems are caused by paging services, mobile phone satellites, telemetry services for power supply, waterpower and earthquake activity, or radar systems, but some causes are unknown. In the worst case, harmful to radio astronomy, the Sesan VLBI station has not been able to do any observations at 92 cm due to serious radio interference problems since 1992. Still more serious interference coming from satellites can be expected in the next decade. International efforts on frequency protection should be urgently pursued if ground-based radio astronomy is to survive.

Software Saber Used to Worst Case Analysis of On-Satellite Switching Power Supply

2013 ◽  
Vol 443 ◽  
pp. 735-740 ◽  
Author(s):  
Qian Zhang ◽  
Ke Cheng Liu ◽  
De Quan Li
Keyword(s):  
Power Supply ◽  
Case Analysis ◽  
Worst Case Analysis ◽  
Switching Power Supply ◽  
Worst Case ◽  
Switching Power ◽  
Error Range

The worst case analysis by means of software Saber is implemented on a three-output flyback switching power supply. The analysis results offer a criterion to definite error range of the device parameters.

scholarly journals Managing contamination delay to improve Timing Speculation architectures

2016 ◽  
Author(s):  
Naga Durga Prasad Avirneni ◽  
Prem Kumar Ramesh ◽  
Arun K Somani
Keyword(s):  
Performance Improvement ◽  
Short Path ◽  
Performance Enhancement ◽  
Propagation Delay ◽  
Performance Impact ◽  
Worst Case ◽  
Circuit Delay ◽  
Timing Speculation ◽  
Better Than

Timing Speculation (TS) is a widely known method for realizing better-than-worst-case systems. Aggressive clocking, realizable by TS, enable systems to operate beyond specified safe frequency limits to effectively exploit the data dependent circuit delay. However, the range of aggressive clocking for performance enhancement under TS is restricted by short paths. In this paper, we show that increasing the lengths of short paths of the circuit increases the effectiveness of TS, leading to performance improvement. Also, we propose an algorithm to efficiently add delay buffers to selected short paths while keeping down the area penalty. We present our algorithm results for ISCAS-85 suite and show that it is possible to increase the circuit contamination delay by up to 30% without affecting the propagation delay. We also explore the possibility of increasing short path delays further by relaxing the constraint on propagation delay and analyze the performance impact.

Power Supply Noise Analysis Using Neural Network and Genetic Algorithm Based on Automatic Test Equipment

2003 ◽  
Author(s):  
Eric Liau ◽  
Doris Schmitt-Landsiedel
Keyword(s):  
Genetic Algorithm ◽  
Power Supply ◽  
Noise Analysis ◽  
Test Equipment ◽  
Power Supply Noise ◽  
Automatic Test Equipment ◽  
Automatic Test ◽  
Worst Case ◽  
Novel Approach ◽  
Supply Noise

Abstract Power supply noise (PSN) is becoming more severe as technology scales, and can cause signal distortion and increase gate delay. This can further result in improper circuit operation. In this paper, we propose a novel approach based on ATE (automatic test equipment) that teaches neural networks (NN) to correctly classify a set of worst case input patterns with respect to the maximum instantaneous current. This can be thought of as a learning behavior of chip power consumption change due to different input patterns. Then a genetic algorithm (GA) was applied to further optimize this set of NN worst case patterns. A final set of worst case patterns were expected to detect a small critical sequence of high switching currents that was directly related to the worst case power supply noise. This novel diagnosis approach can efficiently identify the defective design or weakness due to PSN as well as locate the defect or weaknesses within the design.

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