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US 2007/0176638 A1Published application
Output driver that operates both in a differential mode and in a single mode
AssigneeSamsung Electronics Co., Ltd.
InventorHwan-Wook Park
Life of this patent
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Abstract
An output driver of a semiconductor memory device that operates in a differential mode and in a single mode is disclosed. The output driver includes a current supplying circuit that operates as a resistor in a single mode and as a current source in a differential mode. Accordingly, the semiconductor memory device including the output driver can have high test efficiency, since the number of test pins utilized during a test operation can be selectively reduced for low frequency tests.
Claims14
An output driver comprising:
- a first transistor having an input terminal to which a first input signal is applied, a first output terminal coupled to a first node, and a second output terminal coupled to a first output node;
- a second transistor having an input terminal to which a second input signal is applied, a first output terminal coupled to the first node, and a second output terminal coupled to a second output node;
- and
- a first current supplying circuit coupled to the first node, and configured to operate as a current source in a differential mode, and configured to operate as a resistor in a single mode in response to a mode selecting signal.
1 more element
An amplifying circuit comprising:
- a first transistor having an input terminal to which a first input signal is applied, a first output terminal coupled to a first node, and a second output terminal coupled to a first output node;
- a second transistor having an input terminal to which a second input signal is applied, a first output terminal coupled to the first node, and a second output terminal coupled to a second output node;
- and
- a first current supplying circuit coupled to the first node, and configured to operate as a current source in a differential mode, and configured to operate as a resistor in a single mode in response to a mode selecting signal.
1 more element
Dependencies are inferred from the claim text.