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US 2009/0051433 A1Published application
Differential sensing with high common mode rejection
AssigneeAMI Semiconductor Belgium BVBA
InventorJean-Paul Eggermont
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Abstract
A differential operation circuit that uses the differential input signals to generate a reference voltage that fluctuates with the common mode voltage of the differential input signals. The reference voltage includes a common mode component that generally follows the common mode voltage of the differential input signals. The common mode component of the reference voltage is used to fully or almost fully offset the common mode voltage of the differential input signals, thereby increasing the differential operation circuit's common mode rejection characteristics.
Claims20
A differential operation circuit comprising:
- a first differential input node;
- a second differential input node;
- a common mode following circuit configured to generate a signal that follows a common mode of a differential signal applied to the first and second differential input nodes;
- and
- a differential output signal generation circuit configured to generate a signal with reduced common mode noise using as inputs the current generated by the common mode following circuit as well as the differential input signal applied to the first and second differential input nodes.
2 more elements
A differential operation circuit comprising:
- a first differential input node;
- a second differential input node;
- a common mode following circuit configured to generate a signal that follows a common mode of a differential signal applied to the first and second differential input nodes;
- a first differential output signal generation circuit configured to generate a first signal with reduced common mode noise using as inputs the signal generated by the common mode following circuit as well as the signal applied to the first differential input node;
- and
- a second differential output signal generation circuit configured to generate a second signal with reduced common mode noise using as inputs the signal generated by the common mode following circuit as well as the signal applied to the second differential input node.
3 more elements
A differential operation circuit comprising:
- a first differential input node;
- a second differential input node;
- a common mode following circuit configured such that, when a first differential input signal is applied to the first differential input node and a second differential input signal is applied to the second differential input node, the common mode following circuit generates at least one signal that at least partially follows a common mode of the first and second differential input signals;
- a first differential output signal generation circuit configured to:
- A) be coupled to the first differential input node so as to receive at least a derivative of the first differential input signal when the first differential input signal is applied to the first differential input node, wherein the at least the derivative of the first differential input signal includes a common mode component;
- B) be coupled to the common mode following circuit so as to receive at least a derivative of a first signal generated by the common mode following circuit, the first signal generated by the common mode following circuit including a common mode component;
- and
- C) generate a first differential output signal that uses the common mode component of the at least the derivative of the first differential input signal and the common mode component of the at least the derivative of the first signal generated by the common mode following circuit in a manner that reduces a common mode component of the first differential output signal;
- and
- a second differential output signal generation circuit configured to:
- A) be coupled to the second differential input node so as to receive at least a derivative of the second differential input signal when the second differential input signal is applied to the second differential input node, wherein the at least the derivative of the second differential input signal includes a common mode component;
- B) be coupled to the common mode following circuit so as to receive at least a derivative of a second signal generated by the common mode following circuit, the second signal generated by the common mode following circuit including a common mode component;
- and
- C) generate a second differential output signal that uses the common mode component of the at least the derivative of the second differential input signal and the common mode component of the at least the derivative of the second signal generated by the common mode following circuit in a manner that reduces a common mode component of the second differential output signal.
11 more elements
Dependencies are inferred from the claim text.