SEMICONDUCTOR INTEGRATED CIRCUIT
First Claim
1. A semiconductor integrated circuit comprising:
- a first reception terminal and a second reception terminal receiving a differential signal;
a squelch circuit which has a first noninverting input terminal and a first inverting input terminal, which compares differential amplitude between a signal which is input to the first noninverting input terminal and a signal which is input to the first inverting input terminal with a preset threshold, and which outputs a signal depending upon a result of the comparison;
a first switch circuit which brings about conduction between the first reception terminal and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the first reception terminal and the first noninverting input terminal when it is switched to an off-state;
a second switch circuit which brings about conduction between the second reception terminal and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the second reception terminal and the first inverting input terminal when it is switched to an off-state;
a third switch circuit which brings about conduction between the first reception terminal and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the first reception terminal and the first inverting input terminal when it is switched to an off-state; and
a fourth switch circuit which brings about conduction between the second reception terminal and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the second reception terminal and the first noninverting input terminal when it is switched to an off-state.
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Accused Products
Abstract
A semiconductor integrated circuit has a squelch circuit which has a first noninverting input terminal and a first inverting input terminal, which compares differential amplitude between a signal which is input to the first noninverting input terminal and a signal which is input to the first inverting input terminal with a preset threshold, and which outputs a signal depending upon a result of the comparison. The semiconductor integrated circuit has a first switch circuit between a first reception terminal and the first noninverting input terminal. The semiconductor integrated circuit has a second switch circuit between a second reception terminal and the first inverting input terminal. The semiconductor integrated circuit has a third switch circuit between the first reception terminal and the first inverting input terminal. The semiconductor integrated circuit has a fourth switch circuit between the second reception terminal and the first noninverting input terminal.
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Citations
20 Claims
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1. A semiconductor integrated circuit comprising:
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a first reception terminal and a second reception terminal receiving a differential signal; a squelch circuit which has a first noninverting input terminal and a first inverting input terminal, which compares differential amplitude between a signal which is input to the first noninverting input terminal and a signal which is input to the first inverting input terminal with a preset threshold, and which outputs a signal depending upon a result of the comparison; a first switch circuit which brings about conduction between the first reception terminal and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the first reception terminal and the first noninverting input terminal when it is switched to an off-state; a second switch circuit which brings about conduction between the second reception terminal and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the second reception terminal and the first inverting input terminal when it is switched to an off-state; a third switch circuit which brings about conduction between the first reception terminal and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the first reception terminal and the first inverting input terminal when it is switched to an off-state; and a fourth switch circuit which brings about conduction between the second reception terminal and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the second reception terminal and the first noninverting input terminal when it is switched to an off-state. - View Dependent Claims (2, 5, 7, 9, 11, 12, 15, 16, 19)
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3. A semiconductor integrated circuit comprising:
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a first reception terminal and a second reception terminal receiving a differential signal; a test terminal applied a DC voltage; a squelch circuit which has a first noninverting input terminal connected to the first reception terminal and a first inverting input terminal connected to the second reception terminal, which compares differential amplitude between a signal which is input to the first noninverting input terminal and a signal which is input to the first inverting input terminal with a preset threshold, and which outputs a signal depending upon a result of the comparison; a first switch circuit which brings about conduction between the test terminal and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the test terminal and the first noninverting input terminal when it is switched to an off-state; a second switch circuit which brings about conduction between ground and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the ground and the first inverting input terminal when it is switched to an off-state; a third switch circuit which brings about conduction between the test terminal and the first inverting input terminal when it is switched to an on-state, and which brings about insulation between the test terminal and the first inverting input terminal when it is switched to an off-state; and a fourth switch circuit which brings about conduction between the ground and the first noninverting input terminal when it is switched to an on-state, and which brings about insulation between the ground and the first noninverting input terminal when it is switched to an off-state. - View Dependent Claims (4, 6, 8, 10, 13, 14, 17, 18, 20)
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Specification