An Energy-Efficient Offset-Cancelling Sense Amplifier

Design of an offset‐tolerant voltage sense amplifier bit‐line sensing circuit for SRAM memories

“…6 c prove that energy is quite insensitive to T ACC . In Table 1, principal results of 180 and 90 nm technologies are compared with the most recent schemes in [3–5] and the much shrunk 22 nm solution in [7].…”

“…6c prove that energy is quite insensitive to T ACC . In Table 1, principal results of 180 and 90 nm technologies are compared with the most recent schemes in [3][4][5] and the much shrunk 22 nm solution in [7]. Conclusions: This design study shows that the proposed offset-tolerant VSA has a noteworthy potential in reducing the offset problem and the sense delay, given by the summation of T ACC , T INV and pre-charging time.…”

“…Conclusions: This design study shows that the proposed offset-tolerant VSA has a noteworthy potential in reducing the offset problem and the sense delay, given by the summation of T ACC , T INV and pre-charging time. Although the energy consumption is higher than the scheme in [3], this last, in turn, corrects only the offset induced by V TH distortions. The relative higher number of devices is compensated by the reduced dimensions of the devices.…”

“…The lowering of the bias voltages, for diminishing the power dissipation, has additionally worsened the offset related problem of performing reliable memory operations. In order to overcome this issue, during the last years, improved sensing circuits have been proposed in the literature, equipped with offset compensation or cancellation apparatus [2,3]. While offset compensation schemes are based on the increment of the signal-to-noise ratio by the pre-amplification of the sensed voltage, operated by differential amplifiers or charge transfer mechanisms, the offset cancellation schemes directly intervene on the reduction of V OS by exploiting integrated op-amps with high gain.…”

An Energy-Efficient sense amplifier using 180nm for SRAM

“…The process variations may also results in the threshold mismatch which affects the offset voltage of the circuit. So offset compensation techniques are required to produce the accurate output [4]. Factors that determine the suitability of a SA includes sensing delay, power/energy consumption, die area, and resolution [1].…”