High speed differential signal detection
First Claim
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1. A differential signal detection circuit, comprising:
- a capacitor; and
a detection circuit receiving (a) a differential signal comprising a first component signal and a second component signal, and (b) a threshold voltage, said detection circuit charging said capacitor when one of said component signals of said differential signal has an amplitude exceeding said threshold voltage by a predetermined amount.
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Abstract
A method and a circuit detect the presence of a high-speed signal, such as a high-speed differential signal, based on a software-programmable signal amplitude threshold. In one embodiment, when the amplitude threshold is exceeded, a current is generated to charge a capacitor. The voltage on the capacitor is compared to a second pre-set voltage in a low-speed comparator, which provides an output voltage indicating detection of the high-speed signal.
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Citations
12 Claims
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1. A differential signal detection circuit, comprising:
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a capacitor; and
a detection circuit receiving (a) a differential signal comprising a first component signal and a second component signal, and (b) a threshold voltage, said detection circuit charging said capacitor when one of said component signals of said differential signal has an amplitude exceeding said threshold voltage by a predetermined amount. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a differential signal, comprising:
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receiving a differential signal comprising a first component signal and a second component signal;
receiving a threshold voltage; and
charging a capacitor when one of said component signals of said signal has an amplitude exceeding said threshold voltage by a predetermined amount. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification