Static current testing apparatus and method for current steering logic (CSL)
First Claim
1. A logic circuit comprising:
- a folded source coupled logic gate having an input, an output, and a bias node, the logic gate consuming a substantially constant current during a normal operating mode; and
bias switching means for switching the bias node between a source of bias voltage in the normal operating mode and a source of shut-off voltage in a static current testing mode.
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Accused Products
Abstract
A static current testing method for single-ended or differential logic circuits having a static bias current in normal operation. The static current testing method includes switching a first bias node between a first bias voltage, in a normal operational mode, and a first shut-off voltage, in a first static current testing phase, and measuring the current supplied to the logic circuit in the testing phase. For differential circuits, the static current testing method further includes an additional step of switching a second bias node between the second bias voltage in the normal operational mode and the second shut-off voltage in a second static current testing phase. A bias switching means is used to switch between the normal bias voltage and the testing voltage. A cell switching means is coupled to a diode-connected transistor for forcing the circuit output low and for isolating the diode-connected transistor from the output.
20 Citations
23 Claims
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1. A logic circuit comprising:
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a folded source coupled logic gate having an input, an output, and a bias node, the logic gate consuming a substantially constant current during a normal operating mode; and bias switching means for switching the bias node between a source of bias voltage in the normal operating mode and a source of shut-off voltage in a static current testing mode. - View Dependent Claims (2)
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3. A logic circuit comprising:
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a static current logic gate having an input, an output, and a bias node, the static current logic gate including a diode-connected transistor having a gate and a drain forming an anode coupled to the output; and bias switching means for switching the bias node between a source of bias voltage in a normal operating mode and a source of shut-off voltage in a static current testing mode. - View Dependent Claims (4, 5, 21, 22)
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6. A differential logic circuit comprising:
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a static current logic gate having first and second differential inputs, first and second differential outputs, and first and second bias nodes; first bias switching means for switching the first bias node between a first source of bias voltage in a normal operating mode and a first source of shut-off voltage in a first static current testing phase; and second bias switching means for switching the second bias node between a second source of bias voltage in the normal operating mode and a second source of shut-off voltage in a second static current testing phase. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A static current testing method for logic circuits comprising:
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providing a logic circuit including a static current logic gate having an input, a bias node for receiving a bias voltage, and an output; switching the bias node between a source of bias voltage in a normal operational mode and a source of shut-off voltage in a static current testing mode; and measuring a static current consumed by the logic gate - View Dependent Claims (14, 15, 16, 17)
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18. A static current testing method for logic circuits comprising:
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providing a logic circuit including a static current logic gate having a pair of differential inputs, a first bias node for receiving a first bias voltage, a second bias node for receiving a second bias voltage, and a pair of differential outputs; applying the first bias voltage to the first bias node during a normal mode; applying the second bias voltage to the second bias node during the normal mode; switching the first bias node between the first bias voltage and a first shut-off voltage in a first static current testing phase; and measuring a static current consumed by the logic gate in the first testing phase. - View Dependent Claims (19, 20, 23)
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Specification