Current sense amplifiers, memory devices and methods
First Claim
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1. An amplifier, comprising:
- a first transistor coupled between first and second nodes;
a second transistor coupled between third and fourth nodes, a control gate of the first transistor being coupled to the third node and a control gate of the second transistor being coupled to the first node;
a third transistor coupled between the first and third nodes and configured to form a current path between the first and third nodes responsive to a first signal;
a first enable circuit coupled between a first power source node and the first node and between the first power source node and the third node, the first enable circuit configured to form a current path between the first power source node and the first node and between the first power source node and the third node responsive to a second signal different from the first signal; and
a second enable circuit coupled between a second power source node and the second node and between the second power source node and the fourth node, the second enable circuit configured to form a current path between the second power source node and the second node and between the second power source node and the fourth node responsive to the second signal.
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Abstract
A current sense amplifier may include one or more clamping circuits coupled between differential output nodes of the amplifier. The clamping circuits may be enabled during at least a portion of the time that the sense amplifier is sensing the state of a memory cell coupled to a differential input of the sense amplifier. The clamping circuits may be disabled during the time that the sense amplifier is sensing the state of a memory cell at different times in a staggered manner. The clamping circuits may be effecting in making the current sense amplifier less sensitive to noise signals.
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Citations
20 Claims
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1. An amplifier, comprising:
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a first transistor coupled between first and second nodes; a second transistor coupled between third and fourth nodes, a control gate of the first transistor being coupled to the third node and a control gate of the second transistor being coupled to the first node; a third transistor coupled between the first and third nodes and configured to form a current path between the first and third nodes responsive to a first signal; a first enable circuit coupled between a first power source node and the first node and between the first power source node and the third node, the first enable circuit configured to form a current path between the first power source node and the first node and between the first power source node and the third node responsive to a second signal different from the first signal; and a second enable circuit coupled between a second power source node and the second node and between the second power source node and the fourth node, the second enable circuit configured to form a current path between the second power source node and the second node and between the second power source node and the fourth node responsive to the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An amplifier, comprising:
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a first transistor coupled between first and second nodes; a second transistor coupled between third and fourth nodes, a control gate of the first transistor being coupled to the third node and a control gate of the second transistor being coupled to the first node; a first control circuit comprising a first pair of transistors coupled between the first and third nodes and configured to form a first current path between the first and third nodes responsive to a first signal; a second control circuit comprising a second pair of transistors coupled between the first and third nodes and configured to form a second current path between the first and third nodes responsive to a second signal; a first enable circuit coupled to the first node and the third node and configured to form a current path between a first power source node and the first node and between the first power source node and the third node; and a second enable circuit coupled to the first node and the third node and configured to form a current path between a second power source node and the first node and between the second power source node and the third node. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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at a first time; coupling a first node to a second node via a first pair of transistors of a first control circuit of an amplifier in response to a first signal; and coupling the first node to the second node via a second pair of transistors of a second control circuit of an amplifier in response to a second signal; at a second time, enabling first and second enable circuits to sense an input signal via a pair of cross-coupled transistors; and at third time, disabling the first and second control circuits in response to the first and second signals, respectively. - View Dependent Claims (18, 19, 20)
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Specification