Interface circuit of differential signaling system
First Claim
1. An interface circuit, which is connected to a data transmission line through a termination resistor at both a first signal input terminal and a second signal input terminal and receives a pair of differential signals transmitted through the data transmission line as reception data, comprising:
- a receiving end operational amplifier, having a non-inversion input terminal, an inversion input terminal and an output terminal, for receiving one differential signal at the non-inversion input terminal through the first signal input terminal as a first signal, receiving the other differential signal at the inversion input terminal through the second signal input terminal as a second signal, and sending out an output signal from the output terminal; and
impedance control means for setting the receiving end operational amplifier to a high impedance state in a case where the first signal input terminal or the second signal input terminal is set to an open-circuiting state or a short-circuiting state.
3 Assignments
0 Petitions
Accused Products
Abstract
A first differential signal received at an input terminal is input to non-inversion terminals of a first comparator and a receiving end device. A second differential signal lower than the first differential signal is received at another input terminal and is input to inversion terminals of a second comparator and the receiving end device. A first reference voltage higher than the first differential signal is applied to an inversion terminal of the first comparator, and a second reference voltage lower than the second differential signal is applied to a non-inversion terminal of the second comparator. When one input terminal is open-circuited or short-circuited, a voltage higher than the first reference voltage or a voltage lower than the second reference voltage is applied to the non-inversion terminal of the first comparator or the inversion terminal of the second comparator.
9 Citations
8 Claims
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1. An interface circuit, which is connected to a data transmission line through a termination resistor at both a first signal input terminal and a second signal input terminal and receives a pair of differential signals transmitted through the data transmission line as reception data, comprising:
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a receiving end operational amplifier, having a non-inversion input terminal, an inversion input terminal and an output terminal, for receiving one differential signal at the non-inversion input terminal through the first signal input terminal as a first signal, receiving the other differential signal at the inversion input terminal through the second signal input terminal as a second signal, and sending out an output signal from the output terminal; and
impedance control means for setting the receiving end operational amplifier to a high impedance state in a case where the first signal input terminal or the second signal input terminal is set to an open-circuiting state or a short-circuiting state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification