Circuits and methods for bi-directional data communication over isolation channels
First Claim
1. A data communication circuit comprising:
- a differential transmitter configured to transmit a first digital bit stream via a first differential unidirectional isolation channel;
a differential receiver configured to receive a second digital bit stream via a second differential unidirectional isolation channel, the first differential unidirectional isolation channel and the second differential unidirectional isolation channel being defined on a common dielectric substrate; and
a crosstalk suppression circuit being configured to provide;
via a first adjustable capacitance circuit, a first negative feedback signal applied between a positive output terminal of the differential transmitter and a negative input terminal of the differential receiver; and
via a second adjustable capacitance circuit, a second negative feedback signal applied between a negative output terminal of the differential transmitter and a positive input terminal of the differential receiver,the first negative feedback signal and the second negative feedback signal being configured to suppress crosstalk between the differential transmitter and the differential receiver due to parasitic capacitive coupling between the first differential unidirectional isolation channel and the second differential unidirectional isolation channel in the common dielectric substrate,the data communication circuit being configured to adjust respective capacitances of the first adjustable capacitance circuit and the second adjustable capacitance circuit based on a calibration signal, the calibration signal providing an indication of the parasitic capacitive coupling between the first differential unidirectional isolation channel and the second differential unidirectional isolation channel.
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Accused Products
Abstract
In a general aspect, a data communication circuit can include a transmitter configured to transmit a first digital bit stream via a first unidirectional isolation channel. The data communication circuit can further include a receiver configured to receive a second digital bit stream via a second unidirectional isolation channel. The first unidirectional isolation channel and the second unidirectional isolation channel can be defined on a common dielectric substrate. The data communication circuit can further include a crosstalk suppression circuit configured to provide at least one negative feedback signal to suppress crosstalk between the transmitter and the receiver due to parasitic capacitive coupling between the first unidirectional isolation channel and the second unidirectional isolation channel in the common dielectric substrate.
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Citations
17 Claims
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1. A data communication circuit comprising:
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a differential transmitter configured to transmit a first digital bit stream via a first differential unidirectional isolation channel; a differential receiver configured to receive a second digital bit stream via a second differential unidirectional isolation channel, the first differential unidirectional isolation channel and the second differential unidirectional isolation channel being defined on a common dielectric substrate; and a crosstalk suppression circuit being configured to provide; via a first adjustable capacitance circuit, a first negative feedback signal applied between a positive output terminal of the differential transmitter and a negative input terminal of the differential receiver; and via a second adjustable capacitance circuit, a second negative feedback signal applied between a negative output terminal of the differential transmitter and a positive input terminal of the differential receiver, the first negative feedback signal and the second negative feedback signal being configured to suppress crosstalk between the differential transmitter and the differential receiver due to parasitic capacitive coupling between the first differential unidirectional isolation channel and the second differential unidirectional isolation channel in the common dielectric substrate, the data communication circuit being configured to adjust respective capacitances of the first adjustable capacitance circuit and the second adjustable capacitance circuit based on a calibration signal, the calibration signal providing an indication of the parasitic capacitive coupling between the first differential unidirectional isolation channel and the second differential unidirectional isolation channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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adjusting, by a first data communication circuit, a capacitance of a first crosstalk suppression circuit included in the first data communication circuit, the first crosstalk suppression circuit being configured to suppress crosstalk between a transmitter and a receiver of the first data communication circuit; in response to determining that adjustment of the capacitance of the first crosstalk suppression circuit has been completed, adjusting, by a second data communication circuit, a capacitance of a second crosstalk suppression circuit included in the second data communication circuit, the second crosstalk suppression circuit being configured to suppress crosstalk between a transmitter and a receiver of the second data communication circuit; and after completing adjustment of the capacitance of the second crosstalk suppression circuit; providing a first calibration signal from the first data communication circuit to the second data communication circuit, the first calibration signal being based on a clock signal of the first data communication circuit; providing a second calibration signal from the second data communication circuit to the first data communication circuit, the second calibration signal being based on a clock signal of the first data communication circuit; determining, by the first data communication circuit, based on the second calibration signal; a threshold of a comparator included in the receiver of the first data communication circuit; and a clock recovery delay for a decoder of the first data communication circuit; and determining, by the second data communication circuit, based on the first calibration signal; a threshold of a comparator included in the receiver of the second data communication circuit; and a clock recovery delay for a decoder of the second data communication circuit. - View Dependent Claims (15, 16, 17)
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Specification