Inductive-coupling system and method with compensation to prevent interference

• US 9,455,770 B2
• Filed: 05/22/2015
• Issued: 09/27/2016
• Est. Priority Date: 01/17/2011
• Status: Expired due to Fees

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Yamaguchi, Kouichi
• Primary Examiner(s): VARNDELL, ROSS E
• Application Number:
  US14/719,378
• Publication Number:
  US 20150256230A1
• Time in Patent Office: 494 Days
• US Class Current: 1/1
• 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 by an inductor, comprising:

a driving circuit comprising;

an outgoing signal compensation unit that receives an outgoing data, performs a compensation processing on the outgoing data and outputs a compensated outgoing data; and

a driving unit that receives the compensated outgoing data and outputs an outgoing signal that drives the inductor,

wherein the data rate of the outgoing data is higher than a self-resonant frequency of the inductor and

wherein the compensation processing is performed as preventing an interference between data symbols from occurring on the outgoing signal.

2. The transmitting circuit according to claim 1,

wherein the outgoing signal compensation unit that 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 transmitting circuit for transmitting data with the use of electromagnetic induction generated by driving by an inductor, comprising:

a driver configured by hardware circuitry to;

receive an outgoing data;

perform a compensation processing on the outgoing data having a data rate higher than a self-resonant frequency of the inductor;

generate an outgoing signal based on the compensated outgoing data; and

drive the inductor based on the outgoing signal,

wherein the compensation processing is performed as preventing an interference between data symbols from occurring on the outgoing signal.