Serial transmission of data using spread-spectrum modulation for enhancing electromagnetic compatibility
First Claim
1. A device comprising:
- a transmitter that generates a wobbled first clock signal and that transmits a serial data signal synchronously with the wobbled first clock signal, wherein the transmitter generates the wobbled first clock signal by subjecting a first basic clock signal to spread-spectrum modulation; and
a receiver that receives the serial data signal and that generates several oversampled serial data signals using a blind-oversampling clock and data retrieving unit, wherein the receiver generates a plurality of second clock signals, and wherein the receiver outputs a best-suited one of the several oversampled serial data signals synchronously with a selected one of the plurality of second clock signals.
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Abstract
An apparatus for serial transmission of data over a transmission path in a vehicle uses spread-spectrum modulation to enhance the electromagnetic compatibility with other electrical and electronic components in the vehicle. The apparatus includes a transmitter that subjects a clock signal having a predetermined frequency and phase to spread-spectrum modulation by wobbling a first clock signal within a predetermined frequency range. The serial data signal is transmitted synchronously with the wobbled first clock signal. The apparatus includes a receiver that uses a blind-oversampling clock and data retrieving unit (CDR unit) to receive the serial data signal. The receiver also generates multiple second clock signals. The CDR unit uses a predetermined algorithm to output the best-suited one of several oversampled serial data signals synchronously with a selected one of the second clock signals. A corresponding method is disclosed for serial transmission of data using spread-spectrum modulation to enhance electromagnetic compatibility.
26 Citations
20 Claims
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1. A device comprising:
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a transmitter that generates a wobbled first clock signal and that transmits a serial data signal synchronously with the wobbled first clock signal, wherein the transmitter generates the wobbled first clock signal by subjecting a first basic clock signal to spread-spectrum modulation; and
a receiver that receives the serial data signal and that generates several oversampled serial data signals using a blind-oversampling clock and data retrieving unit, wherein the receiver generates a plurality of second clock signals, and wherein the receiver outputs a best-suited one of the several oversampled serial data signals synchronously with a selected one of the plurality of second clock signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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generating a wobbled first clock signal by subjecting a first clock signal to spread-spectrum modulation using a wobbling signal;
transmitting a serial data signal synchronously with the wobbled first clock signal;
receiving the serial data signal;
generating a plurality of second clock signals;
generating several oversampled serial data signals using a blind-oversampling clock and data retrieving unit; and
outputting a best-suited one of the several oversampled serial data signals synchronously with a selected one of the plurality of second clock signals. - View Dependent Claims (14, 15, 16, 17)
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18. A system comprising:
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a transmission path in an automotive vehicle, wherein a serial data signal is transmitted across the transmission path, wherein the serial data signal exhibits a frequency spectrum, and wherein electromagnetic interference is emitted by electronic components in the automotive vehicle; and
means for making the transmission path less susceptible to the electromagnetic interference by spreading the frequency spectrum of the serial data signal. - View Dependent Claims (19, 20)
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Specification