A 64Kb CMOS RAM

Konishi, Satoshi; Matsunaga, J.; Ohtani, T.; Sekine, M.; Isobe, M.; Iizuka, Tetsuya; Uchida, Y.; Kohyama, S.

doi:10.1109/isscc.1982.1156311

Cited by 21 publications

(1 citation statement)

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“…Figure 3 depicts another topology [3] employing both NMOS and PMOS cross-coupled pairs and allowing rail-to-rail swings. In this case, X and Y are precharged to VDD and then connected to the memory cell.…”

Section: Sense Amplifiersmentioning

confidence: 99%

The Cross-Coupled Pair - Part II [A Circuit for All Seasons]

Razavi

2014

IEEE Solid-State Circuits Mag.

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Following a general overview of the cross-coupled pair (XCP) in the last issue, we begin to study specific circuit examples incorporating this topology. We deal with digital applications in this issue.The performance of digital circuits can be improved if an XCP is tied between complementary (differential) signals. Specifically, we can add a clocked XCP or replace the PMOS devices in complementary logic with an XCP. The circuits described here exemplify the utility of these techniques. Sense AmplifiersWe examine sense amplifiers not necessarily because we wish to design memories but, rather, because the techniques studied here prove useful in many other applications as well. A common situation in digital (or analog) design is that a small initial imbalance, , V 0 XY appearing between two differential nodes must be amplified, as fast as possible, to (preferably) railto-rail complementary signals. The circuit can be designed such that the two nodes are driven by a high impedance and travel toward the rails with a "natural" time constant [ Figure 1(a)]. Assuming that X and Y are released with an initial imbalance of V 0 XY (e.g., by means of a switch) and that V Vwe can ask, how much time does the circuit take to provide a certain gain, G [1]? Defining the time-dependent gain as ( )/ ,(the "dc" gain). On the1 t 1 0.5 1.0 1.5 2.0 2.5 Stage in (a) Stage in (b) 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 G (c) Figure 1: (a) A simple circuit starting with an initial difference between X and , Y (b) regenerative amplification provided by the XCP, and (c) required normalized time for obtaining a gain of . G

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Section: Sense Amplifiersmentioning

confidence: 99%