The generation of high-voltage nanosecond pulses using all-solid-state pulse generators (ASSPGs) is fundamentally limited by the inherent turn-off delay of power semiconductor switches, which often dictates the lower boundary of the achievable pulse width. To effectively overcome this bottleneck, this paper introduces a new topology for nanosecond pulse generator. The topology module utilizes two series-connected switches that operate with a precise, overlapping conduction period. Crucially, the turn-on transition of the first switch determines the pulse's rising edge, while the turn-off transition of the second switch determines the falling edge. This operational strategy successfully decouples the minimum pulse width from the individual turn-off delay of the power switches, enabling a substantial reduction in the overall pulse duration. The proposed principle is first rigorously validated through detailed circuit simulations, which demonstrate the topology’s potential for realizing nanosecond pulse generation even when utilizing switches with non-negligible turn-off delays. Furthermore, a prototype Marx generator based on the new topology module has been developed and tested. Preliminary experimental results successfully confirm the feasibility of the concept, achieving a stable high-voltage output, such as a 10 kV pulse with an 10 ns pulse width. This work establishes the new topology circuit as a viable and effective solution for next-generation high-performance pulse generators.