I'm currently trying to figure out how to design a free running ramp generator for a project. I'm required to use op amps for both the bootstrap sawtooth generator and the Schmitt trigger, and the required output voltage ranges from -8 to -1 V. This implies that the UTP is -1 and the LTP is -8.
I'm having a hard time understanding how the output of the bootstrap would be negative along with designing the Schmitt trigger such that both threshold voltages are also negative. Any tips? I've attached a picture of the reference circuit that they've provided, which is the only reference material provided to us.