Interface circuit having differential signal common mode shifting means
AssigneeRaytheon Company
InventorEdward T. Lewis
Life of this patent
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Abstract
An interface circuit for converting a differential input voltage, having a common-mode level within a first range, into a differential output voltage having a different, common-mode level. The circuit feeds current between a pair of variable current sources and a pair of input terminals adapted to receive the differential input voltage through a pair of resistors. The amount of current passing through the pair of resistors is related to the common-mode level of the input signal. The resistors produce the differential output voltage at the pair of output terminals with a common-mode level related to the common-mode level of the input voltage translated an amount related to the amount of current passing through them.
Claims6
An interface circuit for converting a differential input voltage having a common-mode level into an output voltage having a different, common-mode level, the interface circuit comprising:
- a voltage level shifting means;
- a current source;
- and
- means for feeding current between the current source and an input terminal adapted to receive the differential input voltage, such current passing through the voltage level shifting means an amount related to the level of the differential input voltage.
An interface circuit for converting a differential input voltage, having a common-mode level within a first range, into a differential output voltage having a different, common-mode level, comprising:
- first and second voltage level shifting means;
- first and second sources of current;
- means for feeding current between the first and second sources and a pair of input terminals adapted to receive the differential input voltage, such current passing through the first and second voltage level shifting means, the amount of current passing through the first and second voltage level shifting means being related to the common-mode level of the input signal;
- and
- wherein the voltage level shifting means produces the differential output voltage at the pair of output terminals with a common-mode level related to the common-mode level of the input voltage translated an amount related to the amount of current passing through the first and second voltage level shifting means.
Dependencies are inferred from the claim text.