TRANSMITTING CIRCUIT, RECEIVING CIRCUIT, AND COMMUNICATION SYSTEM EQUIPPED THEREWITH

• US 20120183038A1
• Filed: 01/17/2012
• Published: 07/19/2012
• Est. Priority Date: 01/17/2011
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: YAMAGUCHI, Kouichi
• Granted Patent: US 9,071,288 B2
• Time in Patent Office: Days
• US Class Current: 375/233
• CPC Class Codes: H01L 2224/32145 the bodies being stacked
• CPC Class Codes: H01L 2224/48145 the bodies being stacked
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H04B 1/034 Portable transmitters
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04L 25/0266 Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults

Abstract

In a related transmitting circuit employing electromagnetic induction that is used in a communication system, there is a problem in that, because only one inductor is used in the transmitting circuit, it is impossible to perform communication at a data rate higher than the self-resonant frequency of the inductor. A transmitting circuit according to an embodiment of the present invention is a transmitting circuit that drives an inductor to transmit data to a semiconductor chip insulated from a semiconductor chip on which the transmitting circuit is mounted, and includes a driving circuit that receives outgoing data transmitted at a data rate higher than the self-resonant frequency of the inductor and outputs an outgoing signal that drives the inductor at the data rate of the outgoing data.

Claims

1. A transmitting circuit for transmitting data with the use of electromagnetic induction generated by driving an inductor, comprising a driving circuit that receives outgoing data whose data rate is higher than the self-resonant frequency of the inductor, and outputs an outgoing signal that drives the inductor at the data rate of the outgoing data.

2. The transmitting circuit according to claim 1, wherein the driving circuit includes a driving unit that drives the inductor, and an outgoing signal compensation unit that receives the outgoing data, compensates wave distortion of the outgoing data generated owing to the self-resonance of the inductor, and outputs the compensated outgoing data to the driving unit.

3. The transmitting circuit according to claim 2, wherein the outgoing signal compensation unit compensates the wave distortion generated owing to the self-resonance of the inductor with the use of a rate equivalent to the data rate.

4. The transmitting circuit according to claim 3, wherein the outgoing signal compensation unit compensates outgoing data targeted for transmission with the use of n pieces of outgoing data respectively sent 1 cycle to n (wherein n represents a positive integer) cycles before the outgoing data targeted for transmission is sent.

5. The transmitting circuit according to claim 4, wherein the outgoing signal compensation unit compensates the outgoing data with the use of FIR type filtering.

6. The transmitting circuit according to claim 5, further comprising a coefficient adjusting circuit that adjusts compensation coefficients used for the FIR filtering, which is performed by the outgoing signal compensation unit, on the basis of the output waveform of the driving circuit or the incoming signal waveform on another semiconductor chip other than a semiconductor chip on which the transmitting circuit is mounted, and on the basis of the outgoing data.

7. The transmitting circuit according to claim 1, further comprising a precoder circuit that modulates the outgoing data with the use of a transmission function that cancels a transmission function from the input stage of the driving circuit to a determination circuit, which is mounted on the another semiconductor chip, that generates outgoing data from an incoming signal, the precoder outputting the modulated outgoing data to the driving circuit.

8. The transmitting circuit according to claim 1, wherein the inductor is formed on the same semiconductor substrate on which the driving circuit is formed on.

9. A receiving circuit for receiving an outgoing signal generated by electromagnetic induction with the use of an inductor, comprising a determination circuit that outputs incoming data at a data rate higher than the self-resonant frequency of the inductor after determining a logic level of outgoing data from an incoming signal.

10. The receiving circuit according to claim 9, wherein the determination circuit includes an incoming signal compensation unit that compensates wave distortion of the incoming signal generated owing to the self-resonance of the inductor, and generates the compensated incoming signal, and a determination unit that generates the incoming data after determining a logic level of the outgoing data on the basis of the compensated incoming signal.

11. The receiving circuit according to claim 10, wherein the incoming signal compensation unit compensates the wave distortion generated owing to the self-resonance of the inductor at a rate equivalent to the data rate.

12. The receiving circuit according to claim 11, wherein the incoming signal compensation unit compensates the incoming signal on the basis of incoming signals for n cycles respectively received 1 cycle to n cycles before the incoming signal is received.

13. The receiving circuit according to claim 12, wherein the incoming signal compensation unit compensates the incoming signal with the use of FIR type filtering.

14. The receiving circuit according to claim 11, wherein the incoming signal compensation unit compensates the incoming signal on the basis of n pieces of incoming data respectively received 1 cycle to n cycles before the incoming signal is received.

15. The receiving circuit according to claim 14, wherein the incoming signal compensation unit compensates the incoming signal with the use of decision feedback type equalizing processing.

16. The receiving circuit according to claim 15, further comprising a coefficient adjusting circuit that adjusts compensation coefficients used for the decision feedback type equalizing processing, which is performed by the incoming signal compensation unit, on the basis of outgoing data output by the determination unit and an incoming signal generated by the decision feedback type equalizing processing.

17. The receiving circuit according to claim 9, wherein the inductor is formed on the same semiconductor substrate on which the determination circuit is formed.

18. A communication system comprising:

a transmission line that includes a first inductor and a second inductor that are electromagnetically coupled with each other;

a driving circuit that drives the first inductor on the basis of received outgoing data; and

a determination circuit that generates incoming data on the basis of an incoming signal input via the second inductor,

wherein the driving circuit and the determination circuit transmit the outgoing data at a data rate higher than the self-resonant frequencies of the first and second inductors.

19. The communication system according to claim 18, wherein at least one of the driving circuit and the determination circuit includes a compensation unit that compensates the distortion of waveforms generated on the transmission line at a data rate equivalent to the data rate.

20. The communication system according to claim 18, wherein at least one of the first or second inductors is formed on the same semiconductor substrate on which a circuit coupled to the at least one inductor is mounted.