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NEM Relay-Based Sequential Logic Circuits for Low-Power Design

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3 Author(s)
Venkatasubramanian, R. ; DSP Syst. Group, Texas Instrum., Dallas, TX, USA ; Manohar, S.K. ; Balsara, P.T.

Nanoelectromechanical (NEM) relays are a promising class of emerging devices that offer zero off-state leakage and behaves like an ideal switch. The zero leakage operation has generated lot of interest in low power logic design using these relays [1],[2]. This paper presents various sequential circuit topologies using NEM relays and analyzes their power, performance, and area tradeoffs. The mechanical delay is inversely proportional to the gate-base voltage Vgb. This paper also presents an integrated voltage doubler-based flip-flop that improves the performance by 2× by overdriving Vgb. An electromechanical model which accounts for the mechanical, electrical, and dispersion effects of the suspended gate relay operating at 1 V with a nominal air gap of 5-10 nm has been developed based on published fabrication results in . Three sequential logic benchmark circuits were designed using NEM relays to verify the correctness of operation of the proposed circuits. This study explores different relay-based latch and flip-flop topologies, proposes fast sequential circuits that can operate at a frequency of 1/2tm (theoretical fastest frequency for NEM relay logic circuits) and further improves speed of sequential circuits by distributed charge boosting.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:12 ,  Issue: 3 )

Date of Publication:

May 2013

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