Hey guys,

So I ran into abit of a problem while bread-boarding my triangle wave generator.
I simulated the circuit on LTSpice with the LM6132 model and it does produce a triangle wave at 100khz however when I bread-boarded it, the triangle wave can only reach 50khz under and the wave itself is distorted. I am wondering what could be the possible cause of this.

I am using a circuit composed of an integrator and a non-inverting Schmitt trigger, similar to:
I Know C and R determines the frequency, C = ~330pF and R = ~10k

 

Hi Mike, welcome to the forums!

When posting a question please be as pedantically explicit as you can. In this schematic you have unknown resistors, unknown reference and unknown Vdd voltage. Knowing these may help diagnose what the unknown distortion is. (Did I beat that dead horse soundly enough?)

Anyway, that Schmidt trigger is pretty critical to making this work. The output on pin 1 should be a square wave. If the op amp is not fast enough to make a square wave that distortion runs right thru to the output.

 

Maybe because implemented in a protoboard?

 

Hi,

It sounds like the LT Spice model is over estimating the slew rate of the op amp. To get 100kHz with a plus and minus 5v triangle would take an op amp with 20v/us slew rate and the op amp being used is closer to 10v/us. To get up to 50kHz (with a plus and minus 5v triangle) would take an op amp with 10v/us slew rate, which the op amp used actually can do.

However, to be more certain we need the other values as Ernie mentioned. We need the two other resistors and the power supply voltages. These are all important to figure this out right as it could be something else like the amplitude is too low or something.