TRANSMISSION APPARATUS AND COMMUNICATION SYSTEM

• US 20140072025A1
• Filed: 08/16/2013
• Published: 03/13/2014
• Est. Priority Date: 09/07/2012
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Hijioka, Kenichiro, Matsudaira, Masaharu, Yamaguchi, Koichi
• Granted Patent: US 8,923,379 B2
• Time in Patent Office: Days
• US Class Current: 375/232
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04L 25/03031 using only passive components H04L25/03025 takes precedence
• CPC Class Codes: H04L 25/03127 using only passive components H04L25/03121 takes precedence
• CPC Class Codes: H04L 27/01 Equalisers baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005
• CPC Class Codes: H04L 5/0075 Allocation using proportional fairness
• CPC Class Codes: H04L 7/0041 Delay of data signal
• CPC Class Codes: H04L 7/0091 Transmitter details

Abstract

A transmission apparatus includes a transmission equalizer that equalizes a transmission signal transmitted in a signal transmission performed via a non-contact coupling including a magnetic coupling of a pair of coupling elements. The transmission equalizer creates plural equivalent transmission signals by branching the transmission signal; and includes plural signal paths that respectively give time delays different from each other to the equivalent transmission signals, and respectively multiplies the delayed transmission signals by tap coefficients. In addition, at least one pair of signal paths is set includes a variable delay circuit that can change the corresponding time delay to be given to the corresponding transmission signal.

Claims

1. A transmission apparatus comprising a transmission equalizer that equalizes a transmission signal transmitted in a signal transmission performed via a non-contact coupling including a magnetic coupling of a pair of coupling elements,

wherein the transmission equalizer

creates a plurality of equivalent transmission signals by branching the transmission signal;

and

includes

a plurality of signal paths that respectively give time delays different from each other to the equivalent transmission signals, and respectively multiplies the delayed transmission signals by tap coefficients, and

an output path that provides a filter output based on the total sum of outputs of the signal paths to one coupling element of the pair of the coupling elements,

wherein at least one of the plurality of signal paths includes a variable delay circuit that can change a time delay to be given to the corresponding transmission signal.

2. The transmission apparatus according to claim 1, wherein the relative time delay between at least one pair of signal paths is set to a time interval shorter than a half of a symbol time of the transmission signal.

3. The transmission apparatus according to claim 1, wherein the relative time delay between at least one pair of signal paths is set to a time interval that is shorter than one symbol time of the transmission signal and not equal to one nth of the one symbol time (wherein n is a positive integer).

4. The transmission apparatus according to claim 1, wherein the relative time delay between at least one pair of signal paths is set to the reciprocal number of twice a peak frequency that appears in the voltage transfer function of the non-contact coupling.

5. The transmission apparatus according to claim 1, wherein the relative time delay between at least one pair of signal paths is determined on the basis of a peak that appears in the voltage transfer function of the non-contact coupling.

6. The transmission apparatus according to claim 1, wherein the relative time delay between at least one pair of signal paths is 40 picoseconds to 120 picoseconds.

7. The transmission apparatus according to claim 1,

wherein the signal paths include a first to a third signal paths, and

there is no integral multiple relation between the value of a first relative time delay and the value of a second relative time delay, wherein the first relative time delay is a relative time delay between the first and the second signal paths and the second relative time delay is a relative time delay between the first and the third signal paths.

8. The transmission apparatus according to claim 7, wherein the first relative time delay and the second relative time delay are determined on the basis of a first peak and a second peak that appear in the voltage transfer function of the non-contact coupling.

9. The transmission apparatus according to claim 1, wherein the variable delay circuit includes an amplifier circuit and a variable capacitor circuit that shunt couples the output of the amplifier circuit.

10. The transmission apparatus according to claim 1, further comprising a memory circuit that supplies setting values about the time delays and the tap coefficients to the signal paths.

11. The transmission apparatus according to claim 1, further comprising a control circuit that determines setting values about the time delays and the tap coefficients on the basis of the measurement result of the jitter of a reception signal received via the pair of the coupling elements by a reception apparatus.

12. The transmission apparatus according to claim 1, wherein the pair of the coupling elements are a pair of inductors.

13. The transmission apparatus according to claim 1, wherein the signal transmission is a baseband signal transmission and the transmission signal is a baseband signal encoded by a line code.

19. A communication system comprising:

the transmission apparatus according to claim 1;

a reception apparatus that receives a signal transmitted from the transmission apparatus via the non-contact coupling of the pair of the coupling elements; and

a control mechanism that determines setting values about the time delays and the tap coefficients on the basis of the measurement result of the jitter of the reception signal received by the reception apparatus, and applies the setting values to the transmission equalizer.

20. A communication system comprising:

the transmission apparatus according to claim 1; and

a reception apparatus including a hysteresis buffer that generates an output signal showing a result obtained by comparing a reception signal transmitted from the transmission apparatus via the non-contact coupling of the pair of the coupling elements with a threshold for bit judgment.

14. A transmission apparatus comprising a transmission equalizer that equalizes a transmission signal transmitted in a signal transmission performed via a non-contact coupling including a magnetic coupling of a pair of coupling elements,

wherein the transmission equalizer

creates a plurality of equivalent transmission signals by branching the transmission signal;

and

includes

a plurality of signal paths that respectively give time delays different from each other to the equivalent transmission signals, and respectively multiplies the delayed transmission signals by tap coefficients, and

an output path that provides a filter output based on the total sum of outputs of the signal paths to one coupling element of the pair of the coupling elements,

wherein the relative time delay between at least one pair of signal paths is set to a time interval shorter than a half of a symbol time of the transmission signal.

15. The transmission apparatus according to claim 14, wherein the relative time delay between the at least one pair of signal paths is set to a time interval not equal to one nth of a symbol time (wherein n is a positive integer).

16. The transmission apparatus according to claim 14, wherein the relative time delay between at least one pair of signal paths is set to the reciprocal number of twice a peak frequency that appears in the voltage transfer function of the non-contact coupling.

17. A transmission apparatus comprising a transmission equalizer that equalizes a transmission signal transmitted in a signal transmission performed via a non-contact coupling including a magnetic coupling of a pair of coupling elements,

wherein the transmission equalizer

creates a plurality of equivalent transmission signals by branching the transmission signal;

and

includes

a plurality of signal paths that respectively give time delays different from each other to the equivalent transmission signals, and respectively multiplies the delayed transmission signals by tap coefficients, and

and an output path that provides a filter output based on the total sum of outputs of the signal paths to one coupling element of the pair of the coupling elements,

wherein the relative time delay between at least one pair of signal paths is set to the reciprocal number of twice a peak frequency that appears in the voltage transfer function of the non-contact coupling.

18. The transmission apparatus according to claim 17, wherein the relative time delay between at least one pair of signal paths is set to a time interval that is shorter than one symbol time of the transmission signal and not equal to one nth of the one symbol time (wherein n is a positive integer).