Electrical idle detection circuit including input signal rectifier
First Claim
Patent Images
1. An electrical idle detection circuit, comprising:
- a full wave rectifier configured to receive differential input signals and provide a rectified output signal based on the differential input signals; and
a first amplifier configured to receive a first input signal based on the rectified output signal and a second input signal based on a reference signal and to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal.
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Abstract
An electrical idle detection circuit including a full wave rectifier and a first amplifier. The full wave rectifier is configured to receive differential input signals and provide a rectified output signal based on the differential input signals. The first amplifier is configured to receive a first input signal based on the rectified output signal and a second input signal based on a reference signal. The first amplifier is configured to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal.
39 Citations
29 Claims
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1. An electrical idle detection circuit, comprising:
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a full wave rectifier configured to receive differential input signals and provide a rectified output signal based on the differential input signals; and
a first amplifier configured to receive a first input signal based on the rectified output signal and a second input signal based on a reference signal and to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrical idle detection circuit, comprising:
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a common mode difference detector configured to receive differential input signals and reduce common mode voltage noise in the differential input signals to provide a filtered common mode voltage and to provide common mode differential output signals based on the filtered common mode voltage;
a first switch controlled via one of the common mode differential output signals to shift a first input signal;
a second switch controlled via another one of the common mode differential output signals to shift a second input signal that is based on a reference signal; and
a first amplifier configured to receive the first input signal and the second input signal and to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An electrical idle detection circuit, comprising:
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means for rectifying differential input signals to provide a rectified output signal based on the differential input signals; and
means for comparing a first input signal that is based on the rectified output signal and a second input signal that is based on a reference signal to provide an output signal that indicates the differential input signals are one of active and in electrical idle. - View Dependent Claims (17, 18, 19, 20)
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21. A method for detecting electrical idle in a communications bus, comprising:
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rectifying differential input signals to provide a rectified output signal based on the differential input signals; and
comparing a first input signal that is based on the rectified output signal and a second input signal that is based on a reference signal to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal. - View Dependent Claims (22, 23, 24)
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25. A method for detecting electrical idle in a communications bus, comprising:
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reducing common mode voltage noise in differential input signals to provide a filtered common mode voltage;
outputting differential output signals based on the filtered common mode voltage;
shifting a first input signal via one of the differential output signals;
shifting a second input signal via another one of the differential output signals; and
comparing the first input signal and the second input signal to provide an output signal that indicates the differential input signals are one of active and in electrical idle based on the first input signal and the second input signal. - View Dependent Claims (26, 27, 28, 29)
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Specification