SYSTEMS AND METHODS FOR COMMON MODE LEVEL SHIFTING
First Claim
1. A common mode voltage level shifting circuit, comprising:
- input nodes configured to receive a differential signal with a first common mode voltage;
a pair of shunt capacitors coupled between the input nodes and a corresponding pair of output nodes;
a threshold voltage circuit, including the output nodes, coupled to the differential signal though the shunt capacitors, the threshold voltage circuit configured to provide a second common mode voltage for the differential signal at the output nodes; and
current sources that are controlled according to a level of the first common mode voltage, the current sources coupled to the output nodes to effect the second common mode voltage.
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Abstract
A common mode voltage level shifting circuit including: input nodes configured to receive a differential signal with a first common mode voltage, a pair of shunt capacitors coupled between the input nodes and a corresponding pair of output nodes, a threshold voltage circuit, including the output nodes, coupled to the differential signal though the shunt capacitors, the threshold voltage circuit configured to provide a second common mode voltage for the differential signal at the output nodes, and current sources that are controlled according to a level of the first common mode voltage, the current sources coupled to the output nodes to effect the second common mode voltage.
7 Citations
30 Claims
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1. A common mode voltage level shifting circuit, comprising:
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input nodes configured to receive a differential signal with a first common mode voltage; a pair of shunt capacitors coupled between the input nodes and a corresponding pair of output nodes; a threshold voltage circuit, including the output nodes, coupled to the differential signal though the shunt capacitors, the threshold voltage circuit configured to provide a second common mode voltage for the differential signal at the output nodes; and current sources that are controlled according to a level of the first common mode voltage, the current sources coupled to the output nodes to effect the second common mode voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for shifting a common mode voltage level, the method comprising:
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receiving a differential signal with a first common mode voltage level; coupling the differential signal to a pair of output nodes through a pair of shunt capacitors; generating a current that is controlled by the first common mode voltage level; and mirroring the current through the output nodes to generate a second common mode voltage level at the output nodes. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A common mode voltage level shifting circuit, comprising:
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input nodes configured to receive a differential signal with a first common mode voltage; a pair of shunt capacitors coupling the differential signal to output nodes of the circuit; a threshold voltage circuit, including the output nodes, configured to receive the differential signal though the shunt capacitors, the threshold voltage circuit configured to provide a second common mode voltage for the differential signal at the output nodes; and means for driving the output nodes to effect the second common mode voltage, the driving means being controlled according to a level of the first common mode voltage. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A data receiver circuit comprising:
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first circuitry configured to receive a differential signal having a first common mode voltage level; a level-shifting component coupled to the first circuitry, the level shifting component including;
a current source configured to produce a current inversely related to the first common mode voltage and configured to drive the current to output nodes of the level-shifting component, a pair of shunt capacitors coupling the differential signal to the output nodes, a pair of transistors in communication with the shunt capacitors, each of the transistors configured to receive a respective component of the differential signal and current from the current source, wherein respective voltage drops at each of the transistors defines a second common mode voltage level; andsecond circuitry in communication with the output nodes of the level shifting component, the second circuitry configured to receive a modified version of the differential signal at the second common mode voltage level. - View Dependent Claims (29, 30)
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Specification