In this paper, the steady-state performances of a piecewise quadratic auto-tuned slope compensation technique proposed recently to eliminate subharmonic oscillations in dc-dc switching converters are evaluated. With this technique, a self-generated compensating signal is used resulting in a naturally full duty cycle stability domain by appropriately self-adapting the amplitude of the generated signal both in transient and in steady-state regimes. The circuit corresponding to the proposed technique can be implemented using standard analog devices. A boost converter under current mode control is used to validate the theoretical results both by numerical simulations and by experiments showing that the technique efficiently eliminate subharmonic oscillation and is robust against parameter variations such as load current and inductor value.