Interface system for a cog application
First Claim
1. A current driving type transmitter using independent current signals, adapted for transmitting a logic state of data by differential current supplied through a pair of transmission lines composed of a true line and a bar line, comprising:
- a first data current source configured to independently generate and supply positive data current that constitutes the differential current;
a second data current source configured to independently generate and supply negative data current that constitutes the differential current;
a first selection switch configured to supply the positive data current generated by the first data current source to the true line or the bar line through a switching operation depending upon a logic state of data to be transmitted;
a second selection switch configured to supply the negative data current generated by the second data current source to the bar line or the true line through a switching operation depending upon a logic state of data to be transmitted;
an equalizing switch connected between the true line and the bar line and configured to equalize potentials through a switching operation; and
a switching controller configured to control the switching operations of the first selection switch, the second selection switch and the equalizing switch depending upon whether the data to be transmitted transits or not.
1 Assignment
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Accused Products
Abstract
A current driving type transmitter using independent current signals, which can independently generate and transmit differential current indicating a logic state of data to be transmitted, using a difference between positive data current and negative data current without using external current, so that magnitudes of current applied to a pair of transmission lines can be kept constant without being influenced by the design of current sources and processing factors, a current driving type receiver using independent current signals, which can simultaneously convert a difference in levels of current, received through the transmission lines, into a voltage level by a single I-V converter, so that errors of a true line and a bar line can be lessened, and an interface system for COG application, which adopts the transmitter and receiver, so that distortion of transmitted signals can be reduced.
3 Citations
14 Claims
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1. A current driving type transmitter using independent current signals, adapted for transmitting a logic state of data by differential current supplied through a pair of transmission lines composed of a true line and a bar line, comprising:
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a first data current source configured to independently generate and supply positive data current that constitutes the differential current; a second data current source configured to independently generate and supply negative data current that constitutes the differential current; a first selection switch configured to supply the positive data current generated by the first data current source to the true line or the bar line through a switching operation depending upon a logic state of data to be transmitted; a second selection switch configured to supply the negative data current generated by the second data current source to the bar line or the true line through a switching operation depending upon a logic state of data to be transmitted; an equalizing switch connected between the true line and the bar line and configured to equalize potentials through a switching operation; and a switching controller configured to control the switching operations of the first selection switch, the second selection switch and the equalizing switch depending upon whether the data to be transmitted transits or not. - View Dependent Claims (2, 3, 4)
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5. A current driving type receiver adapted for receiving differential current through a pair of transmission lines composed of a true line and a bar line and restoring a logic state of data, comprising:
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a true line current mirror configured to receive current flowing through the true line and generate true line reception current; a bar line current mirror configured to receive current flowing through the bar line and generate bar line reception current; a single I-V converter configured to instantaneously convert a difference in levels of the true line reception current and the bar line reception current into a voltage level corresponding thereto; and a differential amplifier configured to amplify a converted reception voltage, wherein the single I-V converter includes a first resistor which is connected at one end thereof to a node to which the true line reception current is supplied, a second resistor which is connected at one end thereof to a node to which the bar line reception current is supplied, a current source which is commonly connected to the other ends of the first resistor and the second resistor, and a terminal of a power supply voltage into and from which the true line reception current and the bar line reception current flow by the current source and which determines levels of reception voltages, wherein the single I-V converter further includes a common voltage generator which is configured such that a first terminal is connected to the current source, a second terminal is connected to a connection node of the true line current mirror and the first resistor so as to be connected to a non-inverting terminal of the differential amplifier, and a third terminal is connected to a connection node of the bar line current mirror and the second resistor so as to be connected to an inverting terminal of the differential amplifier.
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6. A current driving type receiver adapted for receiving differential current through a pair of transmission lines composed of a true line and a bar line and restoring a logic state of data, comprising:
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a single I-V converter including a third resistor which is connected at one end thereof to the true line and receives true line reception current, a fourth resistor which is connected at one end thereof to the bar line and receives bar line reception current, and a current source which has one end commonly connected to the other ends of the third resistor and the fourth resistor and the other end connected to a ground terminal; and a differential amplifier configured to receive through a non-inverting terminal and an inverting terminal thereof a difference in voltage levels converted in the single I-V converter and amplify the difference. - View Dependent Claims (7)
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8. A differential current driving type interface system, adapted for transmitting a logic state of data using different current, receiving the differential current, and restoring the logic state of the data, comprising:
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a transmitter including a first data current source configured to independently generate and supply positive data current that constitutes the differential current, a second data current source configured to independently generate and supply negative data current, a first selection switch configured to supply the positive data current to a true line or a bar line through a switching operation depending upon a logic state of data to be transmitted, a second selection switch configured to supply the negative data current to the bar line or the true line through a switching operation, an equalizing switch connected between the true line and the bar line and configured to equalize potentials of transmission lines, and a switching controller configured to control the switching operations; the transmission lines composed of the true line and the bar line which are supplied with the positive data current and the negative data current through the switching operations of the first and second selection switches; and a receiver configured to instantaneously convert a difference in levels of true line reception current received from the true line and bar line reception current received from the bar line into a voltage level, and restore data. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification