Multi-threshold flip-flop circuit having an outside feedback

a flip-flop circuit and multi-threshold technology, applied in the field of flip-flop circuits and multi-threshold flip-flop circuits having an outside feedback, can solve the problems of circuits having significant increased complexity, low threshold voltage giving rise to a higher sub-threshold leakage current, and increasing the relative level of leakage currents
US20030067322A1Inactive Publication Date: 2003-04-10IBM CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
IBM CORP
Publication Date
2003-04-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A multi-threshold flip-flop circuit having an outside feedback is disclosed. The multi-threshold flip-flop circuit comprises a master latch and a slave latch. Coupled between an output of the slave latch and an input of the master latch, a switchable feedback path is utilized to retain logical values of the slave latch during a sleep mode of the flip-flop circuit.
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Description

[0001] 1. Technical Field

[0002] The present invention relates to logic circuits in general, and in particular to flip-flop circuits. Still more particularly, the present invention relates to a multi-threshold flip-flop circuit having an outside feedback.

[0003] 2. Description of the Prior Art

[0004] In order to maintain high performances in electronic devices having a scaled-down power supply voltage, threshold voltages for transistors within the electronic devices need to be scaled down also. However, a lower threshold voltage will give rise to a higher subthreshold leakage current. Especially for battery-powered electronic devices, the relative level of leakage currents increases even more during sleep mode. One solution for reducing the amount of current leakage in sleep mode is to use a circuit commonly known as multi-threshold complementary-metal-oxide semiconductor (MTCMOS) circuit. Generally speaking, a MTCMOS circuit uses low-threshold transistors during active mode but cuts o...

Claims

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