Sawtooth Oscillator Waveform

[dotcom.com]

I am currently working on a sawtooth oscillator and I cant seem to get the shape right. I'm not sure if it's a component issue. I am trying to use this to implement into a 10V boost converter.

EDIT:
I lowered my capacitance and R5 values and was able to generate a sawtooth. However I'm not sure how good it is especially at the start of it. I Attached the new screenshot of the transient and schematic below the original

[Avelino Sampaio]

Watch the video of our participant W2aew

[wasedadoc]

I am currently working on a sawtooth oscillator and I cant seem to get the shape right. I'm not sure if it's a component issue. I am trying to use this to implement into a 10V boost converter.

Why do you want to use that to implement a boost converter?

[dobsonr741]

I cant seem to get the shape right.

The schematics is off. Follow the one on the youtube video. It uses a more precise current generator to have the linearity you wanted.

[dotcom.com]

I am currently working on a sawtooth oscillator and I cant seem to get the shape right. I'm not sure if it's a component issue. I am trying to use this to implement into a 10V boost converter.

Why do you want to use that to implement a boost converter?

I am making this oscillator to meet certain design parameters of my boost converter. It is a part of my control scheme as I also have to create PWM, error amplifier and maybe a compensation network.
Where my parameters are:
a) Input voltage Vin=5V
b) Maximum load current = 250mA
c) Output voltage ripple < 50mV
d) LIR under 20%
e) Clock frequency=100KHz
f) Power efficiency >90%
Amplifier and switches must be implemented at transistor level.

[dobsonr741]

Seems this question has already been asked and responded on https://www.chegg.com/homework-help/questions-and-answers/b-justification-description-chosen-architecture-c-design-procedure-values-relevant-compone-q114095153

[Someone]

Seems this question has already been asked and responded on https://www.chegg.com/homework-help/questions-and-answers/b-justification-description-chosen-architecture-c-design-procedure-values-relevant-compone-q114095153

Certainly smelled like homework. Discrete transistor design, LIR, fixed frequency ? completely non-realistic.

[dobsonr741]

Though I liked that it made me review the UJT oscillator, it's nice how the youtuber used a current source to linearize the sawtooth.

[Doctorandus_P]

Without even looking at the schematic (except for the 5V power supply rails):
The rising flank is fairly lineair up to about 4V, and then it starts to taper off. Conclusion is that your current source needs about 1V of headroom to work properly, and you should switch your switch before your capacitor is charged to 4V.