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Embedded resistor

Embedded resistor
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Embedded resistor

 

Summary :
Embedded resistor is a resistive “blank slate” – providing the PCB designer with a key tool for addressing contemporary electronic issues requiring passive resistors or resistive films. These resistors are thin film planar resistive elements that are part of the printed and etched circuitry of a standard PCB layer. They are used in a variety of electronic devices, spanning a broad spectrum of the Electronics Industry. Applications range from consumer electronics (smart phone MEMS microphones) to aerospace and defense electronics (satellites, space probes, missiles and fighter aircraft). It is used globally as a high volume, cost effective alternative to discrete SMT resistors.

Embedded resistor is a resistive “blank slate” – providing the PCB designer with a key tool for addressing contemporary electronic issues requiring passive resistors or resistive films. These resistors are thin film planar resistive elements that are part of the printed and etched circuitry of a standard PCB layer. They are used in a variety of electronic devices, spanning a broad spectrum of the Electronics Industry. Applications range from consumer electronics (smart phone MEMS microphones) to aerospace and defense electronics (satellites, space probes, missiles and fighter aircraft). It is used globally as a high volume, cost effective alternative to discrete SMT resistors.

Embedded resistor’s resistivity is the resistance in ohms per square and is a dimensionless number. The value of any specific resistor is determined by the ratio of the length of the resistor to its width multiplied by the sheet resistivity used. Example would be a 68 ohm value resistor that uses 25 ohm per square OhmegaPly. The total number of squares required would be 68 ohms divided by 25 ohms per square, or 2.72 squares. If the resistor width is designed to be 10 mils (0.010?) then the length of the resistor must be 10 mils x 2.72 squares or 27.2 mils (0.027?).

Advantages

Advantages include reduced surface EMI (Electrical Magnetic Interference), reduced inductive reactance, improved signal integrity of high speed, high frequency circuits and greater reliability resulting from the elimination of solder joints required for surface mounted resistors. More routing area is made available with elimination of the discrete SMT resistors and their interconnecting traces and vias.

Other Advantages:

  • Help reduce the size of the PCB/board assembly
  • Reduce the manufacturing cost for complex products
  • Minimizes electrical path lengths to reduce parasitic effects in high-frequency circuits
  • Reduces the wiring length of passive components to an IC
  • Decreases parasitic capacitance and inductance
  • Reduces load fluctuations and noise within the system
  • Can position resistors directly underneath the pin of an IC, minimizing potential negative effects, including via inductance
  • Low EMI

Applications:

Embedded resistors are used in all areas of the electronics industry: military/aerospace, computer, telecommunications, consumer and medical electronics. Some of the applications include supercomputers, servers, graphic enhancement cards, workstations, application specific integrated circuit simulators (ASIC), automated test equipment (ATE), active electronically scanned array radar systems (AESA), resistive cards (r-cards), probe cards, telecommunications switching cards, burn-in boards, heater elements, antennas, base stations, and cellular telephone modules (MEMs microphones). Embedded resistors are used as a direct replacement for discrete resistors. Some examples are as potentiometers, line terminators, pull-up/pull-down resistors, series and parallel terminating resistors, isolation resistors, filters (as part of an RC filer), power dividers and as heater elements.

Electronic Interconnect (EI) will expand its capabilities by offering the OhmegaPly®embedded resistor technology as part of its design options. EI will work closely with Ohmega Technologies, the makers of OhmegaPly®, to ensure that we meet customer’s design requirements and provide technical support with any questions relating to embedded resistors.

Please write to us engineering@eiconnect.com for more info.

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