Method and apparatus for controlling the common-mode output voltage of a differential buffer
First Claim
1. A device for controlling the common-mode output voltage of a differential buffer to a desired value, comprising:
- a first current source providing a first current to the outputs of said differential buffer;
a second current source providing a second current to the outputs of said differential buffer, said second current being opposite in polarity and lower in magnitude than said first current;
sensing means for sensing the common-mode output voltage of said differential buffer and providing an adjustment current at a node of said sensing means; and
adding means for adding said adjustment current to said second current to adjust the common-mode output voltage to said desired value.
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Abstract
A method and device for controlling the common-node output voltage of a differential buffer is disclosed. According to the invention, the common-mode output voltage of the differential buffer is controlled to a desired value by supplying a first current to the output of the differential buffer and supplying a second current to the output of the differential buffer, the second current being opposite in polarity and lower in magnitude than the first current. The common-mode output voltage of the differential buffer is sensed and an adjustment current is added to the second current to adjust the common-mode output voltage to the desired value.
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Citations
35 Claims
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1. A device for controlling the common-mode output voltage of a differential buffer to a desired value, comprising:
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a first current source providing a first current to the outputs of said differential buffer; a second current source providing a second current to the outputs of said differential buffer, said second current being opposite in polarity and lower in magnitude than said first current; sensing means for sensing the common-mode output voltage of said differential buffer and providing an adjustment current at a node of said sensing means; and adding means for adding said adjustment current to said second current to adjust the common-mode output voltage to said desired value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An integrated circuit including a device for controlling the common-mode output voltage of a differential buffer to a desired value, comprising:
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a first current source providing a first current to the outputs of said differential buffer; a second current source providing a second current to the outputs of said differential buffer, said second current being opposite in polarity and lower in magnitude than said first current; sensing means for sensing the common-mode output voltage of said differential buffer and providing an adjustment current at a node of said sensing means; and adding means for adding said adjustment current to said second current to adjust the common-mode output voltage to said desired value. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of controlling the common-mode output voltage of a differential buffer to a desired value, comprising the steps of:
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supplying a first current to the outputs of said differential buffer; supplying a second current to the outputs of said differential buffer, said second current being opposite in polarity and lower in magnitude than said first current; sensing the common-mode output voltage of said differential buffer and providing an adjustment current at a node of said sensing means; and adding said adjustment current to said second current to adjust the common-mode output voltage to said desired value.
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Specification