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The Designer's Guide Community Forum › Simulators › Circuit Simulators › analogLib exponential voltage source: Can I add periodicity to it?

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analogLib exponential voltage source: Can I add periodicity to it? (Read 3849 times)

agaurav009 New Member Offline Posts: 2 Germany	analogLib exponential voltage source: Can I add periodicity to it? Sep 01^st, 2008, 4:49am Hi, I need a voltage source which has exponential waveoform (for realistic rise/fall time of a clock). But since I want to use it for a clock source, I want to add periodicity to it. Can anybody help me?
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Geoffrey_Coram Senior Fellow Offline Posts: 1999 Massachusetts, USA	Re: analogLib exponential voltage source: Can I add periodicity to it? Reply #1 - Sep 3^rd, 2008, 8:31am Don't you end up with a discontinuity because the exponential doesn't fully decay by the end of the period?
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Ken Kundert Global Moderator Offline Posts: 2386 Silicon Valley	Re: analogLib exponential voltage source: Can I add periodicity to it? Reply #2 - Sep 3^rd, 2008, 3:06pm Perhaps you could use a pulse source to drive an RC, and then build an ideal buffer? -Ken
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: analogLib exponential voltage source: Can I add periodicity to it? Reply #3 - Sep 4^th, 2008, 12:06am Hi, If you need a clock source which gives more practical rise/fall time, a voltage pulse source + an clock buffer chain is better. Normally in CMOS process, a clock is drived by one or more inverters. Yawei
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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: analogLib exponential voltage source: Can I add periodicity to it? Reply #4 - Jan 2^nd, 2009, 3:42pm Or you could use a pulse or pwl source with edgetype=halfsine - this means that each transition is replaced with a half-period of a sinewave - which is a smoother transition. Andrew.
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