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Noise Suppressor of the Mutex Lines

IP.com Disclosure Number: IPCOM000033790D
Publication Date: 2004-Dec-28
Document File: 2 page(s) / 45K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that suppresses noise for both register files and generic domino muxes. Benefits include a low impact on timing.

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Noise Suppressor of the Mutex Lines

Disclosed is a method that suppresses noise for both register files and generic domino muxes. Benefits include a low impact on timing.

Background

Cross-cap noise has become a dominant problem in the submicron process, particularly on the register file word-lines, and there is a need to devise a way to attenuate the noise. Although the word-lines are mutex, the length of the word-line is long so the cross-cap on the word-line is very high.

Figure 1 shows the generic four mutex word-lines of a register file (or the inputs to a domino mux). When one of the word-lines switches, it attacks its two neighboring lines. This is worsened as the length of the word-line increases. Due to the tight layout of the register file, spacing out the lines is not be feasible.

General Description

Figure 2 shows the circuitry of the disclosed method, where one line can affect only two of its neighbors. For example, when word-line two switches, it will only affect word-line one and three; the sustainers for word-line 1 and 3 keeps them low. As long as the word-lines are mutex, there is no contention between the sustainers and the drivers. 

Note. For a long line, the sustainers should be distributed as shown in Figure 2, to make sure the resistance of the line will not limit the capabilities of the sustainers.

Using a similar technique (see Figure 3), the noise amplitude is reduced to 150mV, and the duration to 70ps. In this implementation, timing may be affected...