Electronic circuit

• US 20060176676A1
• Filed: 12/14/2005
• Published: 08/10/2006
• Est. Priority Date: 12/15/2004
• Status: Active Grant

• Current Assignee: ThruChip Japan Inc.
• Original Assignee: KEIO University
• Inventors: Miura, Noriyuki, Kuroda, Tadahiro, Mizoguchi, Daisuke
• Granted Patent: US 7,546,106 B2
• Time in Patent Office: Days
• US Class Current: 361/780
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base

Abstract

The invention provides an electronic circuit capable of carrying out communications by inductive coupling with minimum power consumption between substrates. In the electronic circuit according to the invention, although the amplification factor of the amplifier 10a is 1, the amplification factors of the amplifiers 10b through 10d are, respectively, 2, 4 and 8. Amplification is carried out at the amplification factors 1 through 15 (=1+2+4+8) as a whole by a combination thereof. The transmit power control register 21 outputs ON and OFF signals to the respective amplifiers 10a through 10d so as to bring about transmit power responsive to the distance to a substrate having a receiver coil which is a destination of transmission (that is, the distance between a transmitter coil and a receiver coil), in further detail, so as to have an amplification factor by which transmit power proportionate to the distance can be obtained, and selects a combination of the amplifiers 10a through 10d.

Claims

1. An electronic circuit according to the invention comprising:

a first substrate including a first receiver coil that is formed by wiring on a substrate and receives signals, and a first receiver circuit into which signals from said first receiver coil are inputted;

a second substrate including a second receiver coil that is formed by wiring on a substrate and receives signals, and a second receiver circuit into which signals from said second receiver coil are inputted; and

a third substrate including a transmitter coil that is formed by wiring on a substrate at a position corresponding to said first receiver coil and said second receiver coil, constructs a communications channel by being inductively coupled with said first receiver coil and said second receiver coil and transmits signals, and a transmitter circuit that outputs signals at the first transmit power in the case of transmitting to said first receiver coil and output signals at the second transmit power different from the first transmit power in the case of transmitting to said second receiver coil.

2. The electronic circuit according to claim 1, wherein

said first substrate has a plurality of said first receiver coils;

said second substrate has a plurality of said second receiver coils, and

said third substrate has a plurality of said transmitter coils that are formed at positions corresponding to said first receiver coil and said second receiver coil, constructs a communications channel by being inductively coupled to said first receiver coil and said second receiver coil, and transmits signals respectively.

3. The electronic circuit according to claim 1, wherein

said transmitter circuit outputs signals to said transmitter coil at transmit power proportionate to the distance between said transmitter coil and said first or said second receiver coil which is a destination of transmission.