access icon free Offset-cancelling current-mode sense amplifier for fast-read eFlash memory

A novel offset-cancelling current-mode sense amplifier (OC-CSA) to improve the sensing speed of embedded flash (eFlash) memory is proposed. To reduce the precharge time related to random address transitions, this OC-CSA adopts a new precharge acceleration scheme. Moreover, by employing offset cancellation, double sensing margin and strong positive feedback techniques, the new OC-CSA can achieve a sensing speed 1.6 × faster than other OC-CSAs. A 130 nm 1 Mb eFlash macro to confirm the high-speed capability of the proposed OC-CSA is fabricated. The experiment results show the new OC-CSA can achieve a read access time of 11 ns at VDD = 1.3 V.

Inspec keywords: current-mode circuits; amplifiers; embedded systems; flash memories; circuit feedback

Other keywords: OC-CSA; embedded flash memory; eFlash macro; voltage 1.3 V; positive feedback techniques; size 130.0 nm; novel offset-cancelling current-mode sense amplifier; random address transitions; sensing speed; precharge acceleration scheme; fast-read eFlash memory; precharge time reduction; storage capacity 1 Mbit; time 11.0 ns; double sensing margin

Subjects: Memory circuits; Semiconductor storage; Amplifiers

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2019.0061
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content/journals/10.1049/el.2019.0061
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