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Silicon capacitor takes on ultra-broadband systems

Posted: 19 Sep 2014     Print Version  Bookmark and Share

Keywords:silicon capacitor  ultra-broadband  UBSC 

IPDiA launched the UBSC capacitor series that provides ultra-broadband performance and reliability, making them ideal for the requirements of the most stringent ultra-broadband applications such as optoelectronics/high-speed data, trans-impedance amplifiers (TIA), receive-and-transmit optical sub-assembly (ROSA/TOSA), synchronous optical networking (SONET), as well as broadband test equipment and broadband microwave/millimetre-wave.

The UBSC capacitors are suitable for DC blocking, feedback, coupling, and bypassing applications in all broadband optoelectronics and high speed data systems. The unique Si Cap technology of integrated passive devices in silicon developed by IPDiA, offers unique performances from 16kHz to 60GHz:

  • Ultra low insertion loss (0.5 dB);
  • Flat frequency response;
  • Excellent return loss;
  • No phase discontinuity;
  • Lower dielectric absorption (0.1 per cent) compared to NP0/X7R;
  • Excellent stability over temperature (0.5 per cent from -55 to 150°C) and DC voltage (0.1 per cent/V). Capacitance value stable even at 16kHz;
  • No AC distortion due to low-to zero piezo effect;
  • Excellent reliability exceeding X7R ceramics by a factor 10 (FIT);
  • Reliable and repeatable UBB performances thanks to a fully controlled production line with high temperature curing (above 900°C) generating an highly pure oxide.

Silicon capacitor

These ultra-broadband capacitors with ultra-deep trenches in silicon have been developed using a semiconductor process which enables the integration of trench MOS capacitors providing high capacitance value of 100nF in a 100µm low profile 0402 SMT. Thanks to the orientation of pads underneath the component, the impedance discontinuity of transmission line can be mitigated.

"The market is continually moving to higher data transmission rates and requires an increasing number of high-performance ultra-broadband components. The 100nF/0402 UBSC ultra-broadband Si Cap has been designed to serve ultra-broadband markets for customers requiring outstanding performance from 16kHz to 60GHz, typical insertion loss of less than 0.5dB and a breakdown voltage of 11VDC. The UBSC Series provide excellent return loss and unit-to-unit performance repeatability," says Olivier Gaborieau, RF Product Line Manager at IPDiA.

The UBSC series are compliant with standard JEDEC assembly rules, making the product fully compatible with high-speed automated pick-and-place manufacturing operations. Case sizes of 0201 and 0603 are also available. The UBSC capacitors are RoHS-compliant and are available with ENiG terminations.

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