Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
hvt , lvt and svt all have the same area. there is a single layout done and VT layer is used to generate the other versions. This helps the chip level tools to swap the cells of different VT to achieve the timing and power goals that are set.
hvt , lvt and svt all have the same area. there is a single layout done and VT layer is used to generate the other versions. This helps the chip level tools to swap the cells of different VT to achieve the timing and power goals that are set.
That layer signifies the Fab people that the oxide layer should be thick.So depending on the Vt layer the silicon dioxide thickness below the poly is varied.
That layer signifies the Fab people that the oxide layer should be thick.So depending on the Vt layer the silicon dioxide thickness below the poly is varied.
Vt variation can be done by changing oxide thickness, but in advanced scaled technology nodes, this is achieved by varying channel doping or changing the gate metal work function (for high-K metal gate transistors). While drawing the layouts in a layout editor (Virtuoso in Cadence, for example), you'd specify whether the transistor type is high/standard/low VT. Some technology nodes have a ULVT device as well, depends on the Fab offering the device options.
HVT will have a high threshold voltage, hence lower leakage and lower current drive. This directly translates to lower active/dynamic power. The converse is true for the LVT or the lowest VT transistor option available.
The cell area will be same irrespective of SVT/HVT/LVT.
The cell layout has many different layers, the difference between SVT & HVT cells are, VTH_P & VTH_N layers ( which are added in HVT Cells ), the difference between SVT & LVT cells are, VTL_P & VTl_N layers ( which are added in LVT Cells ).
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
