Name
Title | ||
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25.7 Time-Borrowing Fast Mux-D Scan Flip-Flop with On-Chip Timing/Power/VMIN Characterization Circuits in 10nm CMOS. |
Abstract | ||
|---|---|---|
Flip-flops (FFs) are key building blocks in high-performance microprocessors, discrete graphics, and hardware accelerators [1]–[3], where pushing frequency has become increasingly critical due to emerging applications, such as AI, machine learning, autonomous driving and security. Time-borrowing (TB) FFs enable a means to fix outlier max-delay paths by reducing process variation and clock skew/jitter margins, resulting in higher frequency operation [4]. However, use of TB FFs is challenging due to higher power cost and lack of area compatibility with conventional FFs for post-placement insertion. Furthermore, increased design complexity require FFs with scan circuits, utilizing either level-sensitive scan design (LSSD), which grows the area significantly with no delay overhead, or the alternate area-efficient rnux-D scan with higher delay. We present a TB fast mux-D scan FF without scan-mux delay overhead and timing, power, and $\mathrm{V}_{\mathrm{MIN}}$ characterization circuits fabricated in 10nm CMOS, occupying 0.682mm2 (Fig. 25.7.7). The fast rnux-D FF achieves: (i) measured rise/fall mean setup time improvement of 17ps/16ps and 19ps/52ps rise/fall mean TB window with 36ps worst-case delay gain for the critical path at 650mV, 25°C; (ii) only 8% energy overhead for single-bit and iso-energy for dual-bit at typical 25% data activity; (iii) $150\mathrm{mVV}_{\mathrm{MIN}}$ improvement due to write-back elimination; (iv) single/dual-bit cell area compatibility with mux-D FF for post-placement swapping; and, (v) 7.2% block-level performance gain. |
Year | DOI | Venue |
|---|---|---|
2020 | 10.1109/ISSCC19947.2020.9062941 | ISSCC |
DocType | Citations | PageRank |
Conference | 0 | 0.34 |
References | Authors | |
0 | 14 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| amit agarwal | 1 | 65 | 5.39 |
| S. K. Hsu | 2 | 521 | 52.06 |
| Simeon Realov | 3 | 26 | 2.92 |
| Mark Anders | 4 | 315 | 50.81 |
| Gregory K. Chen | 5 | 298 | 32.96 |
| Monodeep Kar | 6 | 53 | 12.66 |
| Raghavan Kumar | 7 | 73 | 12.56 |
| Huseyin Sumbul | 8 | 6 | 2.29 |
| Phil Knag | 9 | 18 | 3.17 |
| Himanshu Kaul | 10 | 456 | 51.07 |
| S. Mathew | 11 | 462 | 76.59 |
| Mahesh Kumashikar | 12 | 0 | 0.34 |
| Ram Krishnamurthy | 13 | 650 | 74.63 |
| Vivek De | 14 | 3024 | 577.83 |