US 2006/0052074 A1Published application

Reactance adjustment device, transceiver and transmission device using the same, signal processing circuit suitable for them, reactance adjustment method, transmission method, and reception method

AssigneeNippon Telegraph and Telephone Corporation

InventorsTadashi Minotani, Nobutarou Shibata, Mitsuru Shinagawa

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Abstract

A reactance adjuster includes an electrode (123) inducing an electric-field in an electric-field transmittable medium (121), an adjusting signal generation section (13) outputting alternatingly a high level or a low level signal to a resonance section (7), an electric-field detection section (15) generating an electric signal based on the electric-field in the medium (121), a first electric-charge storing means (C1) storing electric-charge according to the electric signal when the section (13) outputs a high level signal, a second electric-charge storing means (C2) storing electric-charge according to the electric signal when the section (13) outputs a low level signal, a voltage comparator (10) outputting a predetermined signal based on a voltage difference between the storing means, a control section (19) outputting a constant voltage when the first and the second storing means (C1, C2) are storing electric-charge and a voltage based on a predetermined signal when the storing ends.

Claims29

Dependent claims

A reactance adjuster for adjusting reactance caused by a communication apparatus that transmits and/or receives a signal via an electric field transmittable medium (121) and said electric field transmittable medium (121),

a signal generation section (5, 6) generating a probe signal,
an electrode (123) inducing an electric field based on said probe signal in said electric field transmittable medium (121),
a resonance section (7) that is connected between said signal generation section (5, 6) and said electrode (123) and induces a series resonance by adjusting reactance against parasitic capacitance induced between said electric field transmittable medium (123), said communication apparatus, and an earth ground,
an adjusting signal generation section (13) outputting alternatingly a high level signal and a low level signal to said resonator section (7),
an electric field detection section (15) that receives an electric field in said electric field transmittable medium (121) and generates an electric signal based on the received electric field,
a signal output section including a first electric charge storing means (C1) storing an electric charge in accordance with said electric signal while said adjusting signal generation section (13) outputs a high level signal to said resonator section (7), a second electric charge storing means (C2) storing an electric charge in accordance with said electric signal while said adjusting signal generation section (13) outputs a low level signal to said resonator section (7), and a voltage comparator (10) comparing a voltage across said first electric charge storing means (C1) and a voltage across said second electric charge storing means (C2) to output a predetermined signal in accordance with the comparison result, and
a control section (19;
20;
21;
23;
230) that outputs a voltage having a constant voltage value to said resonator section (7) while either one of said first and said second electric charge storing means (C1, C2) is storing an electric charge, and inputs said predetermined signal to output a voltage based on the inputted predetermined signal to said resonator section (7) while said first and second electric charge storing means stop storing an electric charge.

8 more elements

A signal processing circuit comprising:

a first connection means (SW1), one end of which is connected to a positive electrode of a voltage source (Vdd) outputting a predetermined voltage,
a second connection means (SW2), one end of which is connected to the other end of said first connection means (SW1) and the other end of which is connected to a negative electrode of said voltage source,
a first comparison means (211) that compares a predetermined first threshold voltage (V1) and an input voltage and outputs a signal to turn on said first connection means (SW1) when said input voltage is lower than said first threshold voltage (V1),
a second comparison means (212) that compares an input voltage and a second threshold voltage (V2) higher than said first threshold voltage (V1) and outputs a signal to turn on said second connection means (SW2) when said input voltage is higher than said second threshold voltage (V2), and
a capacitor (213), one end of which is connected to said other end of said connection means (SW1) and the other end of which is connected to said negative electrodes.

2 more elements

A method of receiving signal via an electric field transmittable medium (121), comprising:

inducing an electric field based on a probe signal generated from a signal generation portion (5, 6) in said electric field transmittable medium (121) via an electrode (123),
outputting alternatingly a high level signal and a low level signal to a resonance portion (7) generating a series resonance by adjusting a reactance value against parasitic capacitance caused between said electric field transmittable medium (121), a communication apparatus, and an earth ground, said resonance portion (7) being connected in series between said signal generation portion (5, 6) and said electrode (123),
receiving the electric field in said electric field transmittable medium (121) via said electrode (123),
generating an electric signal based on the received electric field,
storing an electric charge based on said electric signal in a first electric charge storing means (C1) when outputting a high level signal to said resonance portion (7), storing an electric charge based on said electric signal in a second electric charge storing means (C2) when outputting a low level signal to said resonance portion (7), and outputting a predetermined signal based on a voltage difference between a voltage across said first electric charge storing means (C1) and a voltage across said second electric charge storing means (C2),
outputting a voltage having a constant voltage value to said resonance portion (7) when either one of said first and said second electric charge storing means (C1, C2) is storing electric charge and outputting a voltage based on said predetermined signal when said first and said second electric charge storing means (C1, C2) stop storing,
receiving the electric field in said electric field transmittable medium via said electrode to generate a receiving data electric signal including data to be received, and
demodulating said receiving data electric signal to obtain said data.

5 more elements

Dependencies are inferred from the claim text.