A 4K static 5-V RAM

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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Semiconductor Devices

重夫¹

1976

The Journal of the Institute of Television Engineers of Japan

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A 4K static 5-V RAM

Cited by 3 publications

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A 4K static clocked and nonclocked RAM design

A 4K static clocked and nonclocked RAM design

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

Semiconductor Devices

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