Download Current Sense Amplifiers: for Embedded SRAM in by Bernhard Wicht PDF
By Bernhard Wicht
This booklet offers a scientific and entire perception into present sensing ideas. as well as describing theoretical and sensible points of present sensing, the writer derives useful layout directions for reaching an optimum functionality via a scientific research of other circuit rules. Voltage experience amplifiers also are thought of, considering the fact that they're used as a last comparator in a present feel amplifier. cutting edge suggestions, reminiscent of repayment of the bitline multiplexer and auto-power-down, are elucidated. even supposing the point of interest is on embedded static random entry reminiscence (SRAM), the cloth awarded applies to any current-providing reminiscence kind, e.g. additionally to rising reminiscence applied sciences corresponding to MRAM. The publication will entice layout engineers in and in addition to researchers wishing to profit approximately, and practice, present sensing techniques.
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Additional info for Current Sense Amplifiers: for Embedded SRAM in High-Performance System-on-a-Chip Designs
2) provides a comparison. Due to strong positive feedback, dynamic latch-type sense amplifiers are fast, but in the presence of mismatch and noise an incorrect decision may occur if the input voltage difference is small. Based on an essential delay and yield analysis the latchtype voltage sense amplifier of Fig. 4 turned out to be well suitable for a second stage in a current sense amplifier. The most important result is that the input dc voltage of the sense amplifier has a major influence on the yield while its impact on the delay can be neglected.
2 Type A - Cascode and Diode Connection 41 but also with respect to stability and operation at low supply voltage. Even though the focus is on sink type implementations, the results from smallsignal analysis are valid independent of sink or source implementation, at most a difference in sign may occur. 2 Type A - Cascode and Diode Connection The circuits of Fig. 3 will be referred to as Type A current sensing. 3a comprises a common-gate structure which forms a cascode [44,66,79]. Cascode circuits are often used due to their low input resistance, defined by the transconductance of the common-gate transistor.
Block diagram of Type A Fig. 6. 6) t= This confirms that high speed can be achieved by large transconductance gm' If the load capacitance G L is small and Tin large, the delay can be approximated by t ~ ~. There is a linear dependence on the bit line capacitance 9", GBL . For a given value of GBL the current sensing delay can be adjusted by choosing an appropriate value for gm' Beside the larger speed this is an important advantage compared to voltage sensing where the delay is determined only by the capacitive discharge of GBL .