LT Spice schmitt oscillator
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From: John Larkin on 8 Oct 2009 17:46 Does anybody have a working LT Spice netlist for a simple schmitt inverter/R-C oscillator? I tried one using the library schmitt inverter and get obscure sim errors, and I don't understand the HELP stuff. What's the third pin in the corner for? Ground? Thanks, John
From: stefano delfiore on 8 Oct 2009 18:14 John Larkin ha scritto: > Does anybody have a working LT Spice netlist for a simple schmitt > inverter/R-C oscillator? I tried one using the library schmitt > inverter and get obscure sim errors, and I don't understand the HELP > stuff. > > What's the third pin in the corner for? Ground? > > Thanks, > > John > Hello John, try this: Version 4 SHEET 1 2100 1172 WIRE 848 -416 752 -416 WIRE 1040 -416 928 -416 WIRE 752 -304 752 -416 WIRE 848 -304 752 -304 WIRE 1040 -304 1040 -416 WIRE 1040 -304 912 -304 WIRE 1104 -304 1040 -304 WIRE 1152 -304 1104 -304 WIRE 752 -272 752 -304 WIRE 752 -160 752 -208 FLAG 752 -160 0 FLAG 1104 -304 out SYMBOL Digital\\schmtinv 848 -368 R0 WINDOW 3 30 111 Left 0 WINDOW 123 34 145 Left 0 SYMATTR InstName A1 SYMATTR Value vhigh=5 vlow=0 trise=25n SYMATTR Value2 tripdt=5n vt=2.5 vh=.9 SYMBOL cap 736 -272 R0 SYMATTR InstName C2 SYMATTR Value 100n ic=0 SYMBOL Misc\\EuropeanResistor 832 -400 R270 WINDOW 0 27 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName R1 SYMATTR Value 100k TEXT 536 -392 Left 0 !.tran 0 200m 0 uic Stefano
From: Joerg on 8 Oct 2009 18:31 John Larkin wrote: > Does anybody have a working LT Spice netlist for a simple schmitt > inverter/R-C oscillator? I tried one using the library schmitt > inverter and get obscure sim errors, and I don't understand the HELP > stuff. > > What's the third pin in the corner for? Ground? > Helmut Sennewald once told me here in the NG. If you want to use the library Schmitt add this to value2: Vhigh=5 Vt=2.5 Vh=1 and this in SpiceLine: Td=5n Accessible by right-clicking the part. Change those values according to the datasheet for the part you actually want to design around. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Rich Grise on 8 Oct 2009 18:52 On Thu, 08 Oct 2009 14:46:34 -0700, John Larkin wrote: > Does anybody have a working LT Spice netlist for a simple schmitt > inverter/R-C oscillator? I tried one using the library schmitt inverter > and get obscure sim errors, and I don't understand the HELP stuff. > > What's the third pin in the corner for? Ground? > We don't do homework. ;-P Cheers! Rich
From: Jim Thompson on 8 Oct 2009 18:54
On Thu, 08 Oct 2009 15:31:30 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> Does anybody have a working LT Spice netlist for a simple schmitt >> inverter/R-C oscillator? I tried one using the library schmitt >> inverter and get obscure sim errors, and I don't understand the HELP >> stuff. >> >> What's the third pin in the corner for? Ground? >> > >Helmut Sennewald once told me here in the NG. If you want to use the >library Schmitt add this to value2: > >Vhigh=5 Vt=2.5 Vh=1 > >and this in SpiceLine: > >Td=5n > >Accessible by right-clicking the part. Change those values according to >the datasheet for the part you actually want to design around. Or use a real Schmidt model instead of behavioral ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |