Barry Breen Leonid Talalaevsky Thin-Film Operation Jerusalem, Israel S

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Barry Breen Leonid Talalaevsky Thin-Film Operation Jerusalem, Israel S

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BENEFITS THIN-FILM DIELECTRIC CHIP CAPACITORS VHF, HIGHER FREQUENCIES
Barry Breen Leonid Talalaevsky Thin-Film Operation Jerusalem, Israel Scot Tripp Ltd., Aldershot, Hants. U.K.
Abstract
Present future cellular networks satellite telecommunications systems demand unique performance characteristics from capacitors incorporated into their designs. meet these requirements, single layer surface mount capacitors have been developed basis thin film technologies. capacitor's single layer thin film construction provides several major performance advantages relative multilayer chips. These much improved (low ESR), consistent repeatable Q/ESR/Ceff/SRF parameters, superior power capability, secondary resonances frequency 40GHz very tight tolerance capacitance value. virtue these characteristics excellent mechanical features, this thin film capacitor ideal surface mount chip high frequency applications.
BENEFITS THIN-FILM DIELECTRIC CHIP CAPACITORS VHF, HIGHER FREQUENCIES
Barry Breen Leonid Talalaevsky Thin-Film Operation Jerusalem, Israel Scot Tripp Ltd., Aldershot, Hants. U.K.
Benefits Thin-Film Dielectric Chip Capacitors VHF, Higher Frequencies
high frequency designs capacitors have traditionally been given little consideration compared other circuit components, particularly semiconductors. However, increasing higher frequencies 450MHz 3GHz region applications such Cellular Communications, 10GHz 18GHz spectrum Satellite video data transmission have emphasized need surface mount (SMD) chip capacitors exhibiting very high consistent performance very tight tolerance capacitance value.
ACCU-Series Solution
Aware high frequency designer's dilemma receive reasonably priced production quantities high performance, consistent, tight tolerance capacitors, AVX/Kyocera developed capacitor based thin film technology which meets these demands. Currently, there series available high volume production: ACCU-F power applications ACCU-P high power circuits.
Construction ACCU-F ACCU-P Capacitors
basic manufacturing process ACCU series capacitors drawn from technology semiconductor industry. Advanced magnetron sputtering systems used metal layer preparation. State-of -the-art PECVD (plasma enhanced chemical vapor deposition) systems used produce dielectric. Class clean room work areas (<100 particles 0.5µm/ft3 provide necessary environment defect-free deposition these thin films (0.5-4 micron thick).
capacitor built special glass substrate using ultra-pure aluminum-copper alloy electrodes extremely loss, highly insulating silicon oxide nitride dielectrics. metal electrodes formed photolithography, thereby maintaining dimensional control +2.5µm. final chip size also held very tight tolerance (+0.03mm) microprocessor controlled diamond dicing chip separation from substrate.
TERMINATION GLASS
thin film process also ideal manufacturing very small chip capacitor sizes addition standard chip sizes. 0403 available 0402 will marketed shortly.
ELECTRODE
SEAL
ACCU-P Power Handling
ability capacitor handle high currents basically determined factors: much heat generated internal losses effectively heat transferred capacitor. ACCU-F internal losses power handling limited thermal conductivity glass construction. ACCU-P capacitors incorporate thermally conductive materials significantly boost heat dissipation capability capacitor. combination losses very high thermal conductivity allows power handling capability unmatched multilayer chips (Fig. These capacitors utilized wide range power applications.
ACCU-P POWER HANDLING AMPERES ACCU-P SIZE 1210
ELECTRODE DIELECTRIC
GLASS
ACCU-F CAPACITOR
ACCU-Series Characteristics
main characteristics ACCU series capacitors provided thin film manufacturing process summarized follows: Ultra-pure, high conductivity electrodes provide very with excellent consistency. Pure, defect free dielectric dielectric constant providing high breakdown field strength, high insulation resistance loss frequencies 40GHz. Very tight dimensional tolerance chip provides consistently unit unit inductance. Precise dimensional control electrodes uniformity dielectric enables very tight capacitance tolerances (+0.05pF <5.6pF), ideal various signal applications. ACCU-P uses thermally conductive materials effectively remove heat from capacitor very high current levels. electrical performance ACCU-series capacitors depicted graphically Figure
(Ohm) SIZE 0805 Multilayer Hi-Q 0.15 ACCU-F 0.05
Multilayer Porcelain
1000 1250 1500 Permitted current difference 10°C between chip center termination
Figure
ACCU Series General Data
ACCU series thin film chip capacitors available with capacitance values from 0.1pF 220pF. This covers great majority values required VHF/UHF higher frequencies. D.C. voltage ratings from 400V even 50VDC rated parts have 500VDC repetitive peak rating. Extensive tests have indicated that breakdown will generally occur below 1500VDC peak. Every batch ACCU-F ACCU-P manufactured life tested sample basis under test conditions +125°C with twice rated voltage applied, testing +85°C under rated voltage; both tests 1,000 hours duration.
0.25
Measured Boonton 34-A
Figure
Additionally, every batch tested high frequency effective capacitance Boonton resonant coaxial line system (EIA Standard RS483), summary results available customer.
0505 10pF FORWARD TRANSMISSION mag. 0.00 (20.000dB/DIV) Multilayer Hi-Q
ACCU-F
wiltron universal test fixture 3680K
ACCU-F SRF=2.8640 PORCELAIN SRF=2.4680
Figure
Applications
AVX/KYOCERA ACCU-F CAPACITORS
ACCU series characteristics give circuit designer possibilities design circuits higher frequency applications, tighter performance requirements, lower costs ease mass production. ACCU series capacitors used applications requiring losses frequencies 40GHz such satellite systems, LNB's (low noise blocks 11-12.5GHz) receivers. typical application cellular telephones (450MHz 900MHz) where high factor ACCU-F resulted elimination amplification stages hence considerable saving costs. Additional cost savings have been realized consistency characteristics ACCU-F which minimizes necessity tuning elements reducing drastically "tweaking" final product important factor high volume production. easy availability tight capacitance tolerances makes ACCU series ideal choice design filters, VCO's matching networks (see diagrams common applications). inherent reliability ACCU series capacitors make them suitable severe environment applications such military communications, airborne systems space usage.
Performance Above Self-Resonant Frequency
microwave frequencies, many capacitors called upon function beyond their Self-Resonant Frequency (SRF). Although capacitor's impedance primarily inductive beyond SRF, device still capacitor. particular concern insertion loss behavior capacitor beyond consistency insertion loss capacitor-tocapacitor basis specific frequency range interest (e.g. band satellite transmissions). Multilayer capacitors, because their variable physical structure, generally perform poorly inconsistently these frequencies. Figure demonstrates typical resonances which occur High-Q Multilayer chip capacitor beyond SRF. laboratory possible designer compensate insertion loss increase specific frequency. However, this cannot sensibly done production basis every capacitor will have different insertion loss characteristic curve, i.e. resonances will occur different frequencies. Comparing ACCU-F insertion loss curve with that multilayer capacitor (Figure seen that ACCU-F curve close that "ideal" calculated capacitor, exhibiting virtually resonance "dips". This smooth curve repeated ACCU-F capacitors lot-to-lot, thereby assuring designer repeatability performance equipment production basis.
following some major applications ACCU-F ACCU-P:
Application Cellular Communication Satellite Cable Vehicle Location Systems Paging Military Communications Test Measurement Filters Amplifers VCO's Matching Networks
Frequency 450MHz 900MHz 900MHz 1.7GHz 2.3GHz 11GHz 18GHz 800MHz 900MHz 1.5GHz 1.6GHz VHF-UHF 40GHz 40GHz
Harmonic Suppressor
Osc.
ACCU-F
ACCU-F
ACCU-F
ACCU-F
Front Filter Matching Network
ACCU-P ACCU-P ACCU-P
ACCU-F/P ACCU-F
Power Filter Matching Network
ACCU-P ACCU-P
ACCU-P
ACCU-P
ACCU-P
ACCU-P
ACCU-P
Myrtle Beach, Tel: 803-448-9411 FAX: 803-448-1943 Vancouver, Tel: 206-696-2840 FAX: 206-695-5836 Olean, Tel: 716-372-6611 FAX: 716-372-6316 Raleigh, Tel: 919-878-6200 FAX: 919-878-6462 Biddeford, Tel: 207-282-5111 FAX: 207-283-1941 Limited, Fleet, Hants, England Tel: (01252) 770000 FAX: (01252) 770001 S.A., France Tel: 6918 4600 FAX: 6928 7387 AVXGmbH, Germany Tel: 08131 9004-0 FAX: 08131 9004-44 s.r.l., Milano, Italy Tel: 02-665 00116 FAX: 02-614 2576 AVX/Kyocera (HK) Ltd. Tel: 852-363-3303 FAX: 852-765-8185 AVX/Kyocera (Singapore) Pte. Ltd. Tel: (65) 258-2833 FAX: (65) 258-8221 Israel Ltd. Tel: 972-957-3873 FAX: 972-957-3853 AVX/Kyocera Corp. Tel: 75-593-4518 FAX: 75-501-4936
S-TFD2.5M194-R

Barry Breen Leonid Talalaevsky Thin-Film Operation Jerusalem, Israel S

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