Electronic circuit
First Claim
1. An electronic circuit comprising:
- a first substrate comprising a first coil and a transmitting circuit for causing a pulse current in a first direction to flow through the first coil at each change of logical values of transmit data, a prearranged logical value being located in a head of each packet of transmit data; and
a second substrate comprising a second coil coupled inductively to the first coil, a receiving circuit connected to the second coil, and a control circuit connected the receiving circuit,wherein the receiving circuit comprises;
a comparator, including an initialization transistor and an output node, for outputting a single pulse signal with a single polarity, by determining, with the use of a threshold voltage, an induced voltage with a double pulse shape induced in the second coil by the pulse current in the first direction; and
a sequential circuit, coupled to the output node, for inverting the output whenever the single pulse signal is inputted,wherein the initialization transistor initializes the output node to a prearranged logical value during an initialization operation, andwherein the control circuit performs the initialization operation at the head of each data packet.
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Accused Products
Abstract
A low-power high-speed asynchronous inductive-coupling transmission and reception technology is provided, in which a current signal of a single pulse is made to flow through a transmitting coil, and a voltage signal of a double pulse induced in an inductively-coupled receiving coil can be received asynchronously. A transmitting circuit for performing non-contact proximity communication adopts a configuration in which current flows through a first coil in a first direction for each change of a logical value of transmit data. A receiving circuit connected to a second coil coupled inductively to the first coil employs a comparator which determines an induced voltage of a double pulse induced in the second coil by current in the first direction and outputs a unipolar single pulse signal. Whenever the single pulse signal outputted by the comparator is inputted, the receiving circuit inverts the output in a sequential circuit and reproduces receive data.
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Citations
7 Claims
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1. An electronic circuit comprising:
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a first substrate comprising a first coil and a transmitting circuit for causing a pulse current in a first direction to flow through the first coil at each change of logical values of transmit data, a prearranged logical value being located in a head of each packet of transmit data; and a second substrate comprising a second coil coupled inductively to the first coil, a receiving circuit connected to the second coil, and a control circuit connected the receiving circuit, wherein the receiving circuit comprises; a comparator, including an initialization transistor and an output node, for outputting a single pulse signal with a single polarity, by determining, with the use of a threshold voltage, an induced voltage with a double pulse shape induced in the second coil by the pulse current in the first direction; and a sequential circuit, coupled to the output node, for inverting the output whenever the single pulse signal is inputted, wherein the initialization transistor initializes the output node to a prearranged logical value during an initialization operation, and wherein the control circuit performs the initialization operation at the head of each data packet. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic circuit, comprising:
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a first substrate comprising a first coil and a transmitting circuit for causing a pulse current in a first direction to flow through the first coil at each change of logical values of transmit data, a prearranged logical value being located in a head of each packet of transmit data; and a second substrate comprising a second coil coupled inductively to the first coil, a receiving circuit connected to the second coil, and a control circuit connected the receiving circuit, wherein the receiving circuit comprises; a comparator, including an initialization transistor and an output node, for outputting a single pulse signal with a single polarity, by determining, with the use of a threshold voltage, an induced voltage with a double pulse shape induced in the second coil by the pulse current in the first direction; and a sequential circuit, coupled to the output node, for inverting the output whenever the single pulse signal is inputted, wherein the first substrate further comprises a third coil and a third-coil transmitting circuit for causing to flow, through the third coil, a pulse current in a different direction depending on the change of a logical value of the transmit data, wherein the second substrate further comprises a fourth coil coupled inductively to the third coil and a fourth-coil receiving circuit connected to the fourth coil, wherein the third-coil transmitting circuit determines pulse width of the pulse current, wherein the pulse width is made wide enough to shape an induced voltage induced in the fourth coil according to the rate of change of the pulse current, like a pair of single pulses with different polarities, and wherein the fourth-coil receiving circuit comprises a hysteresis comparator determining the induced voltage with the shape of single pulses and outputting the determination result.
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7. An electronic circuit, comprising:
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a first substrate comprising a first coil and a transmitting circuit for causing a pulse current in a first direction to flow through the first coil at each change of logical values of first transmit data, a prearranged logical value being located in a head of each packet of first transmit data; and a second substrate comprising a second coil coupled inductively to the first coil, a receiving circuit connected to the second coil, and a control circuit connected the receiving circuit, wherein the receiving circuit comprises; a comparator, including an initialization transistor and an output node, for outputting a single pulse signal with a single polarity, by determining, with the use of a threshold voltage, an induced voltage with a double pulse shape induced in the second coil by the pulse current in the first direction; and a sequential circuit, coupled to the output node, for inverting the output whenever the single pulse signal is inputted, wherein the first substrate further comprises a third coil and a third-coil transmitting circuit for causing to flow, through the third coil, a pulse current of a different direction depending on the change of a logical value of second transmit data, wherein the second substrate further comprises a fourth coil coupled inductively to the third coil, a fourth-coil receiving circuit connected to the fourth coil, and a control circuit processing receive data received by the receiving circuit, wherein the third-coil transmitting circuit determines the pulse width of the pulse current based on a delay time generated by a delay element, wherein the pulse width is made wide enough to shape an induced voltage induced in the fourth coil according to the rate of change of the pulse current, like a pair of single pulses with different polarities, wherein the fourth-coil receiving circuit comprises a hysteresis comparator determining the induced voltage with the shape of single pulses and outputting the determination result, wherein the second transmit data comprises 2-bit dummy data with different logical values in a head of each data packet, and wherein the control circuit ignores the two bits in the head of each packet of the receive data.
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Specification