I assume you have a pwm converter with either straight voltage mode control or current mode control. In either case, the frequency of the ramp limits your loop gain crossover frequency and the amplitude of the ramp scales the overall loop gain. Furthermore, any glitches in the ramp can cause all sorts of stability problems. Straight voltage mode control is fairly simple. The loop gain is proportional to the inverse of the amplitude of the ramp. Current mode control is more complex because you actually have two ramps: the same ramp you have for voltage control and in addition, a current compensation ramp to stabilize the current loop. I can recommand a few papers on current compensation but I am not sure they will be easy to find because they are somewhat old:
1. R.B Ridley, "A New Small-Signal Model for Current-Mode Control". Power Conversion and Intelligent Motion Conference proceedings, Oct. 16-19, 1989.
2. R.D. Middlebrook, "Topics in Multiple-Loop Regulators and Current-Mode Programming. IEEE Power Electronics Specialists Conference proceedings, June 26-29, 1989.
3. R.D. Middlebrook and S. Cuk. "Advances in Switched-mode Power Conversion". TESLAco.
You should find a wealth of papers on current mode control in the archives of the IEEE power electronics specialists conference. I suspect most papers will be at least 10 years old.
As I re-read your question, it occurs to me that perhaps you are asking about circuit design, not systems design. There are many ways to generate a ramp. Most power control chips generate it internally. If you are designing the ramp circuitry yourself, you could try texts such as
Millman and Taub, "Pulse, digital, and switching waveforms". McGraw Hill. This is an older text based on bipolar transistors. Something similar for newer technologies may exist. The main thing to worry about is keeping the ramp clean. As I said before, any imperfection in the ramp will adversely affect performance.