the oscillator i designed does not oscillate,why?

[atxa]

did not evaluate to a waveform

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200kHZ

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[rockycheng]

A reset signal may help.

 

[atxa]

i can see the square wave rather than triangular wave.
i checked the frequency of the square-wave. it's correct
so,i am puzzled.

 

[tom_hanks]

check the capacitor and proper ground....

 

[pkalavakuru]

Operation Voltage(VDD) take pulse wise linear source and dimension it, so that after some time(100us) it goes to from 0 to 5 Volts)...

Then its starts oscillating

 

[atxa]

Operation Voltage(VDD) take pulse wise linear source and dimension it, so that after some time(100us) it goes to from 0 to 5 Volts)...

Then its starts oscillating

i do not understand what you mean?
please say clearly,thanks
it's my circuit problem or others ?
and which part is the key problem?

when i started to simulate, the simulator said as below:
[quote="*error* Expression <VT("/triangle""...........")> did not evaluate to a waveform[/quote]
but the square-wave is perfect,,why,why,why?

 

[Fom]

Picture is not illegible.
I cannot recognize any signal name. So I cannot uderstand where you watch your signal. If output it should be square wave.
Triangle should be on capacitor.

 

[pkalavakuru]

U have to trigger it..( just like Turn on ..turn off) Ur VDD must go from 0 to 5V ..in 100 r more micro seconds e.t.c

Ciao

 

[Milad-D]

Just check that is it beneficial to change the name of node on the capacitor to a simple name like vout.