Designer’s Guide Community

yuyulu New Member Offline Posts: 1	Programming Hspice ~ Sep 21^st, 2011, 8:08pm hello does sb know how to implement a full adder? i need a hspice code and circuit diagram
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: Programming Hspice ~ Reply #1 - Sep 22^nd, 2011, 7:22am hello hspice is a circuit simulator..))
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Mohammad A Maktoomi New Member Offline Posts: 3	Re: Programming Hspice ~ Reply #2 - Sep 22^nd, 2011, 9:44am Hi Circuit diagram of CMOS full adder is available in books such as Rabaey and Weste/Harris.Or type "CMOS full adder" in google, you will get images. I encourage you �try writing spice code yourself. & believe me, its very easy. You can learn spice (by just giving few hours) from Rashid's book.
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: Programming Hspice ~ Reply #3 - Sep 26^th, 2011, 6:19pm a transistor level simulation tool for a digital circuit function? Well, yes it can be done, but sure you don't want a digital design tool and a functional level simulation?
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Mohammad A Maktoomi

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Re: Programming Hspice ~
Reply #4 - Sep 26^th, 2011, 9:48pm

Dear Mr. loose-electron

pardon my little knowledge, but i think its not about "it can be done". after all, somebody has to design circuits at transistor level so that HDL people use them from library. Delay calculation, power dissipation, all these parameter is evaluated using lovely "SPICE". In case i sound wrong please guide me, as i am not much in HDLs(actually just started learning verilog).

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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: Programming Hspice ~ Reply #5 - Oct 1^st, 2011, 2:50pm Well, if you want to go that path then start by defining all the gates you need at the transistor level, and hook it all up. Set up the hirarchy at the higher levels and build from the bottom up. As the device gets big, the simulations will get slow.
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