Pipelined DSP design with a true single-phase energy-recovering logic style

We recently invented a true single-phase energy-recovering circuit family, called TSEL, that relies on a cross-coupled latch structure and two DC reference voltages to achieve low energy consumption for a broad range of operating frequencies. In this paper, we explore the application of TSEL to the design of low-energy DSP circuits. Specifically, we describe and evaluate a 6,768-transistor, pipelined TSEL module that performs the 8-point Hadamard transform. In layout simulations with a standard 0.5 μm CMOS technology, our TSEL module functions correctly for operating frequencies in excess of 280 MHz. Above 40 MHz, our TSEL design is more energy-efficient than any other energy-recovering alternative with a similar cross-coupled latch structure. At 280 MHz; it is at least 4 times more energy-efficient than a corresponding static CMOS design