Methods and devices for an energy efficient digital to analog conversion are disclosed. With the achievable sampling rates and output voltage levels, high power RF signals can be synthesized. A plurality of pulses are generated and coupled onto transmission lines. On the other end of the transmission line the pulses are either reflected or transmitted to a load line depending on the status of a termination element. In one embodiment the reflected pulses are collected and sent to a load. The energy in the transmitted pulses can be recovered and reused. In another embodiment the transmitted pulses are collected and transmitted to a load and the energy in the reflected pulses is recovered and reused.