Apr 10, 2006 #1 B bobxing Junior Member level 3 Joined Jan 23, 2005 Messages 25 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 197 vdsat In hspice2005.9 and later, for a simple mos transistor simulation, the op has the calculation of vod=.. and vdsat=.. they might be considerably different. Anyone can tell their difference? Thanks in advance. Bobxing
vdsat In hspice2005.9 and later, for a simple mos transistor simulation, the op has the calculation of vod=.. and vdsat=.. they might be considerably different. Anyone can tell their difference? Thanks in advance. Bobxing
Apr 10, 2006 #2 B bsrivastava Member level 2 Joined Sep 9, 2005 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Activity points 1,701 what is vdsat Difference of Vds and Vdsat is Vod. Vds-Vdsat = Vod thanks -Bharat
Apr 10, 2006 #3 B bobxing Junior Member level 3 Joined Jan 23, 2005 Messages 25 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 197 hspice vod You give me a good clue. Thanks I studied the simulated list file. Vgs-vth=vod, But Vds-vdsat <> Vod! so how come? the vdsat?
hspice vod You give me a good clue. Thanks I studied the simulated list file. Vgs-vth=vod, But Vds-vdsat <> Vod! so how come? the vdsat?
Jun 9, 2006 #4 Material Member level 1 Joined Sep 30, 2002 Messages 34 Helped 5 Reputation 10 Reaction score 2 Trophy points 1,288 Activity points 122 vdsat For long channel device Vod equal to Vdsat For short channel device There existed a lot of second order effects So Vdsat is not simply equal to Vod If you want to find out how the hspcie get the vdsat you can refer to the hspice manual, model level. While in hand calculte we use vod(vgs - vth) instead of Vdsat to simplified the calculation process.
vdsat For long channel device Vod equal to Vdsat For short channel device There existed a lot of second order effects So Vdsat is not simply equal to Vod If you want to find out how the hspcie get the vdsat you can refer to the hspice manual, model level. While in hand calculte we use vod(vgs - vth) instead of Vdsat to simplified the calculation process.
Oct 4, 2008 #5 M mpig09 Full Member level 4 Joined Aug 26, 2005 Messages 232 Helped 8 Reputation 16 Reaction score 2 Trophy points 1,298 Location Taipei Activity points 2,810 vdsat and vod Dear all: Please reference this: http://www.ece.uci.edu/docs/hspice/hspice_2001_2-162.html If MOS is linear region, vod will closed to vdsat, but when MOS in sat region, vod will bigger than vdsat. If you use vod to design you circuit, you will get more margin to ensure the mos in sat region when circuit in different corners and temp. mpig
vdsat and vod Dear all: Please reference this: http://www.ece.uci.edu/docs/hspice/hspice_2001_2-162.html If MOS is linear region, vod will closed to vdsat, but when MOS in sat region, vod will bigger than vdsat. If you use vod to design you circuit, you will get more margin to ensure the mos in sat region when circuit in different corners and temp. mpig