Systems and methods for common mode detection
AssigneeTexas Instruments Incorporated
InventorsSumantra Seth, Kanan Saurabh
Life of this patent
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Abstract
Various systems and methods for common mode detection are disclosed. As one example, a common mode detection circuit including a differential input stage, a common mode replica stage, and an amplifier is disclosed. The differential input stage exhibits an input common mode, and includes two differential inputs. A signal from the differential input stage representing the input common mode is electrically coupled to an input of the amplifier. Another input of the amplifier is electrically coupled to the common mode replica stage, and the amplifier outputs a signal indicative of the input common mode.
Claims20
A common mode detection circuit, the circuit comprising:
- a differential input stage, wherein the differential input stage includes a first differential input and a second differential input, wherein the differential input stage exhibits an input common mode;
- and wherein the differential input stage is electrically coupled to an amplifier;
- a common mode replica stage, wherein the common mode replica stage is electrically coupled to the amplifier;
- and
- wherein the amplifier drives a signal indicative of the input common mode.
A differential receiver, the differential receiver comprising:
- a differential input stage, wherein the differential input stage includes a first differential input and a second differential input, wherein the differential input stage exhibits an input common mode;
- and wherein the differential input stage is electrically coupled to an amplifier;
- a common mode replica stage, wherein the common mode replica stage is electrically coupled to the amplifier;
- wherein the amplifier drives an amplifier output, and wherein the amplifier output is indicative of the input common mode;
- and
- a comparator, wherein a first input of the comparator is electrically coupled to the amplifier output, wherein a second input of the comparator is electrically coupled to a reference voltage, and wherein the comparator is operable to drive a comparator output, and wherein the comparator output is a non-differential representation of a received differential signal.
A common mode detection circuit, the circuit comprising:
- a common mode extractor circuit, wherein the common mode extractor circuit provides a signal offset from the common mode;
- and
- a differential input circuit, wherein the differential input circuit includes a first transistor electrically coupled to a first differential input, a second transistor electrically coupled to a second differential input, and wherein a gate of the first transistor and a gate of the second transistor are each electrically coupled to the signal offset from the common mode.
Dependencies are inferred from the claim text.