Coarse/fine delay element design in 28 nm FD-SOI

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Sourikopoulos, Ilias | Cathelin, Andreia | Kaiser, Andreas | Frappé, Antoine

Edité par HAL CCSD ; Springer International Publishing

International audience. This chapter starts by highlighting the requirements and existing techniques in producing digital delay, summarizing the state of the art. Subsequently, a topology assessment is presented based on specified performance metrics. The proposed delay cell which was designed, fabricated, and characterized is then described. Specifically, the proposed design is based on a topology with low-supply-noise sensitivity and low jitter. Functionality is extended to support coarse/fine control for the output delay value, without the need for additional hardware. This is made possible by taking advantage of the body-biasing capabilities available in FD-SOI technology. The proposed delay element presents unique performance characteristics in terms of the achieved delay resolution and delay dynamic range. The chapter concludes with the demonstration of a delay line prototype, fabricated in ST 28 nm FD-SOI technology. After a general overview of delay techniques the proposed topology is described, by focusing on the major design aspects. Measurement results are then presented and a short discussion follows on the characterization findings.

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