Differential amplifier and bit-line sense amplifier adopting the same
First Claim
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1. A differential amplifier, comprising:
- a load connected between a voltage source, a first and a second output terminals;
a first transistor connected between the first output terminal and a first node, the third transistor being turned on depending on a first input signal;
a second transistor connected between the second output terminal and the first node, the second transistor being turned on depending on a second input signal;
a MOSFET resistor connected between the first node and a second node, the MOSFET resistor having a resistance which is variable depending on a potential of the first output terminal or the second output terminal; and
a common current source connected to the second node.
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Abstract
A bit-line sense amplifier is disclosed that includes switching elements to sequentially modify the sense amplifier to a negative feedback differential amplifier, a normal differential amplifier, a positive feedback differential amplifier, and a cross-coupled latch, in that order. The sense amplifier sensing data on a pair of bit-lines in a semiconductor memory; and a transistor is connected between one of the differential amplifiers and a common current source. The transistor has a resistance which is variable depending on a potential of an output of one of the differential amplifiers or remains constant by a different power source.
7 Citations
11 Claims
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1. A differential amplifier, comprising:
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a load connected between a voltage source, a first and a second output terminals;
a first transistor connected between the first output terminal and a first node, the third transistor being turned on depending on a first input signal;
a second transistor connected between the second output terminal and the first node, the second transistor being turned on depending on a second input signal;
a MOSFET resistor connected between the first node and a second node, the MOSFET resistor having a resistance which is variable depending on a potential of the first output terminal or the second output terminal; and
a common current source connected to the second node. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A bit-line sense amplifier, comprising:
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a plurality of switching elements to sequentially modify a sense amplifier to operate as a negative feedback differential amplifier, a normal differential amplifier, a positive feedback differential amplifier, and a cross-coupled latch, in that order, wherein the sense amplifier is adapted to sense data on a pair of bit-lines in a semiconductor memory; and
a transistor connected between the differential amplifier and a common current source, the transistor having a resistance which is variable depending on a potential of an output of one of the differential amplifiers or remains constant by a different power source. - View Dependent Claims (9)
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10. A bit-line sense amplifier, comprising:
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a plurality of switching elements to sequentially modify a sense amplifier to operate as a negative feedback differential amplifier, a normal differential amplifier, and a cross-coupled latch depending on control signals, the sense amplifier adapting to sense data on a pair of bit-lines in a semiconductor memory;
a restore means for rewriting the sensed data on the pair of bit-lines and a selected cell in the semiconductor memory; and
a transistor connected between the differential amplifier and a common current source, the transistor having a resistance which is variable depending on a potential of an output of one of the differential amplifiers or remains constant by a different power source. - View Dependent Claims (11)
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Specification