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Low-Power Pulse-Triggered Flip-Flop Design With Conditional Pulse-Enhancement Scheme

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3 Author(s)
Yin-Tsung Hwang ; Dept. of Electr. Eng., Nat. Chung Hsing Univ., Taichung, Taiwan ; Lin, Jin-Fa ; Ming-hwa Sheu

In this paper, a novel low-power pulse-triggered flip-flop (FF) design is presented. First, the pulse generation control logic, an and function, is removed from the critical path to facilitate a faster discharge operation. A simple two-transistor and gate design is used to reduce the circuit complexity. Second, a conditional pulse-enhancement technique is devised to speed up the discharge along the critical path only when needed. As a result, transistor sizes in delay inverter and pulse-generation circuit can be reduced for power saving. Various postlayout simulation results based on UMC CMOS 90-nm technology reveal that the proposed design features the best power-delay-product performance in seven FF designs under comparison. Its maximum power saving against rival designs is up to 38.4%. Compared with the conventional transmission gate-based FF design, the average leakage power consumption is also reduced by a factor of 3.52.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:20 ,  Issue: 2 )

Date of Publication:

Feb. 2012

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