Methods of making coil transducers

• US 8,061,017 B2
• Filed: 02/26/2009
• Issued: 11/22/2011
• Est. Priority Date: 08/28/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Baumgartner, Richard A, Fouquet, Julie E., Trott, Gary R.
• Primary Examiner(s): Kim; Paul D
• Application Number:
  US12/393,596
• Publication Number:
  US 20090243783A1
• Time in Patent Office: 999 Days
• Field of Search: 295/921, 29/621, 296/032.3, 296/05, 296/06, 298/31, 298/32, 298/37, 336/65, 336/83, 336 90- 96, 336/200, 336206-208, 336/323
• US Class Current: 29/606
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 19/08 Transformers having magnetic bias, e.g. for handling pulses
• CPC Class Codes: H01F 2019/085 Transformer for galvanic isolation
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• CPC Class Codes: H01F 27/40 Structural association with built-in electric component, e.g. fuse
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48195 the item being a discrete passive component
• CPC Class Codes: H01L 2224/49111 the connectors connecting two common bonding areas, e.g. Litz or braid wires
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/30107 Inductance
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H03F 2203/45008 the addition of two signals being made by a resistor addition circuit for producing the common mode signal
• CPC Class Codes: H03F 2203/45101 Control of the DC level being present
• CPC Class Codes: H03F 2203/45586 the IC comprising offset generating means
• CPC Class Codes: H03F 3/45192 Folded cascode stages
• CPC Class Codes: H03F 3/45475 : using IC blocks as the active amplifying circuit
• CPC Class Codes: H04B 5/266 : One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04L 25/0266 : Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
• CPC Class Codes: Y10T 29/4902 : Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 : by winding or coiling
• CPC Class Codes: Y10T 29/49073 : by assembling coil and core

Abstract

Various embodiments of means and methods for reducing the pick-up of electromagnetic interference (“EMI”) by coil transducers are described and shown that are configured to provide high voltage isolation and high voltage breakdown performance characteristics in small packages. In some embodiments, the lengths, heights, and horizontal distances between wires electrically connecting transmitter circuits and receiver circuits to coil transducers are minimized and optimized respecting one another.

Claims

1. A method of making a coil transducer system, comprising:

forming a coil transducer comprising a generally planar substrate comprising opposing upper and lower surfaces and including therein a dielectric barrier, the dielectric barrier comprising an electrically insulating, non-metallic, non-semiconductor, low-dielectric-loss material, a first electrically conductive coil disposed above the upper surface of the substrate, the first coil extending between first and second coil input terminals disposed at opposite ends thereof;

a second electrically conductive coil disposed below the lower surface of the substrate;

the second coil extending between first and second output coil terminals disposed at opposite ends thereof; and

providing a transmitter circuit comprising first and second transmitter output terminals;

electrically connecting a first wire between the first transmitter output terminal and the first input coil terminal;

electrically connecting a second wire between the second transmitter output terminal and the second input coil terminal; and

configuring the first and second wires to be substantially parallel to one another, or to exhibit substantially similar angles respecting an azimuth extending along a major axis of the coil transducer, and have substantially a same first length such that the first and second wires are configured to minimize the pick-up of electromagnetic interference (“

EMI”

) thereby.

2. The method of claim 1, wherein the first and second wires are electrically connected to the coil transducer and the transmitter circuit such that an angle between the first and second wires does not exceed about fifteen degrees.

3. The method of claim 1, wherein the first and second wires are electrically connected to the coil transducer and the transmitter circuit such that the substantially similar angles thereof each range between about 0 degrees and about 10 degrees with respect to the major axis.

4. The method of claim 1, wherein the first wire and the second wire are electrically extended a vertical distance over the transmitter circuit and the coil transducer that is substantially the same and does not exceed about 5 mils.

5. The method of claim 1, wherein the first length is selected to range between about 5 mils and about 30 mils.

6. The method of claim 1, wherein a horizontal separation is provided between the first wire and the second wire that does not exceed about 15 mils.

7. The method of claim 1, further comprising providing a receiver circuit comprising first and second input receiver terminals.

8. The method of claim 7, further comprising electrically connecting a third wire between the first receiver input terminal and the first output coil terminal, and electrically connecting a fourth wire between the second receiver input terminal and the second output coil, the third and fourth wires being substantially parallel to one another.

9. The method of claim 8, wherein the third and fourth wires are configured to have substantially a same third length such that the pick-up of electromagnetic interference (“

EMI”

) thereby is minimized.

10. The method of claim 8, wherein the third and fourth wires are electrically connected to the coil transducer and the transmitter circuit such that an angle between the third and fourth wires does not exceed about fifteen degrees.

11. The method of claim 8, wherein the third wire and the fourth wire are extended a vertical distance over the receiver circuit and the coil transducer that does not exceed about 5 mils.

12. The method of claim 8, wherein the third wire has a length selected to range between about 5 mils and about 30 mils.

13. The method of claim 8, wherein a horizontal separation is provided between the third wire and the fourth wire that does not exceed about 15 mils.

14. The method of claim 8, wherein a pair of substantially parallel wires is provided for each of the third wire and the fourth wire.

15. The method of claim 8, wherein the receiver circuit is configured to provide differential output signals across the output terminals of the second coil.

16. The method of claim 1, wherein at least one of the first coil and the second coil is formed to have a trace width not exceeding about 5 mils thereby to minimize the capacitance between the first and second coils.

17. The method of claim 1, wherein a pair of substantially parallel wires is provided for each of the first wire and the second wire.

18. The method of claim 1, wherein the transmitter circuit is configured to provide differential output signals across the input terminals of the first coil.