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Physical

Cadence Virtuoso

December 12, 2018

Cadence Products Run on a variety of UNIX- and PC-based Systems Remote access to the Linux Servers Macintosh User Running Cadence Virtuoso® icfb Library Manager WorkArea: /export/home/mse/zpei/cdscad6 -bash-3.2$ pwd /export/home/mse/zpei/cdscad6/EMlayout -bash-3.2$ ls -rtl total 85 -rw-r–r– 1 zpei grad 1339 Sep 20 2016 cdsinfo.tag -rw-r–r– 1 zpei grad 2736 Sep 20 2016 data.dm drwxr-xr-x 3 zpei grad… read more »

Modeling Power Terminology

November 24, 2015

The power a circuit dissipates falls into two broad categories: Static power Dynamic power Static Power Static power is the power dissipated by a gate when it is not switching – that is, when it is inactive or static. Static power is dissipated in several ways. The largest percentage of static power results from source-to-drain… read more »

Path delay in cross clock domain

October 2, 2015

Sometimes, for cross clock domain timing analysis, incorrect timing report from mistake Path Delay due to big source clock paths latency/skew or target paths latency/skew would lead tool report and fix timing violation wrongly. Designer analysis launch clock paths latency/skew and capture clock paths latency/skew, find out which path(s) is/are too long, for example, it… read more »

Band Theory

July 29, 2015

Problems 1. How does the band gap indicate whether or not your substance is an insulator, semiconductor or conductor? 2. What is the purpose of a p-type semiconductor? An n-type? 3. What is the purpose of understanding band theory? Answers 1. A very large band gap is indicative of an insulator–since it takes a great… read more »

PN junction

July 28, 2015

Figure A. A p–n junction in thermal equilibrium with zero-bias voltage applied. Electron and hole concentration are reported with blue and red lines, respectively. Gray regions are charge-neutral. Light-red zone is positively charged. Light-blue zone is negatively charged. The electric field is shown on the bottom, the electrostatic force on electrons and holes and the… read more »

FinFET and MOSFET

July 28, 2015

Understanding the FinFET semiconductor process -from Youtube How MOSFETs and Field-Effect Transistors work! -from Youtube

Prepare files and check netlist

June 21, 2015

Which files do backend engineers need? Timing: lib RC delay: capTable, QRC tech, QRC lib Physical: lef, gds Route rule: tech lef, tech file Xtalk: cdb Power: VoltageStorm tech, VoltageStorm lib Which files are about design? Netlist, constraint, IO file, scan def  

Prepare files and check netlist

June 21, 2015

Which files do backend engineers need? Timing: lib RC delay: capTable, QRC tech, QRC lib Physical: lef, gds Route rule: tech lef, tech file Xtalk: cdb Power: VoltageStorm tech, VoltageStorm lib Which files are about design? Netlist, constraint, IO file, scan def    

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