Domino logic with variable threshold voltage keeper
First Claim
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1. A domino logic circuit comprising:
- a pulldown circuit having a dynamic node;
a keeper connected to the pulldown circuit at the dynamic node; and
a source of a body bias voltage, the source of the body bias voltage being connected to the keeper to supply the body bias voltage to the keeper to bias the keeper;
wherein source supplies the body bias voltage such that the body bias voltage alternates between a first forward body bias voltage value and a second reverse body bias voltage value.
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Abstract
A variable threshold voltage keeper circuit technique is proposed for simultaneous power reduction and speed enhancement of domino logic circuits. The threshold voltage of the keeper transistor is dynamically modified during circuit operation to reduce the contention current without sacrificing noise immunity. The threshold voltage of the keeper transistor is controlled by a body bias generator which switches between two voltages in accordance with the clock signal.
13 Citations
7 Claims
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1. A domino logic circuit comprising:
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a pulldown circuit having a dynamic node; a keeper connected to the pulldown circuit at the dynamic node; and a source of a body bias voltage, the source of the body bias voltage being connected to the keeper to supply the body bias voltage to the keeper to bias the keeper; wherein source supplies the body bias voltage such that the body bias voltage alternates between a first forward body bias voltage value and a second reverse body bias voltage value. - View Dependent Claims (2, 3, 6)
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4. A domino logic circuit comprising:
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a pulldown circuit having a dynamic node; a keeper connected to the pulldown circuit at the dynamic node; and a source of a body bias voltage, the source of the body bias voltage being connected to the keeper to supply the body bias voltage to the keeper to bias the keeper; wherein the body bias voltage is a reverse body bias voltage; wherein the source supplies the reverse body bias voltage such that the reverse body bias voltage alternates between two values; and wherein the source supplies the reverse body bias voltage such that the reverse body bias voltage alternates between the two values in accordance with a clock signal applied to the domino logic circuit.
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5. A domino logic circuit comprising:
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a pulldown circuit having a dynamic node; a keeper connected to the pulldown circuit at the dynamic node; and a source of a body bias voltage, the source of the body bias voltage being connected to the keeper to supply the body bias voltage to the keeper to bias the keeper; wherein the source supplies the body bias voltage such that the body bias voltage alternates between two values; and wherein the source supplies the body bias voltage such that the body bias voltage alternates between the two values in accordance with a clock signal applied to the domino logic circuit. - View Dependent Claims (7)
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Specification