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RISS 인기검색어
- 검색키워드
- 저자 : Wahlers, R. L. (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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New Low Firing Capacitor Materials and Their Uses in Microelectronic Applications
Stein, S. J.,Wahlers, R. L.,Bless, P. W.,Dychala, D. H.,Huang, C. Y. D. 한국마이크로전자및패키징학회 1994 Seminar on Hybrid Microelectronics and Multichip P Vol.1 No.1
This paper discusses new tape and thick film capacitor dielectrics having dielectric constants from 1,000 to 12,000 and dissipation factors of about 1%. Their low firing temperature requirements (850 to 930℃) reduce capacitor processing costs and permit the use of silver conductors. In addition, the paper provides a guide to the circuit designer regarding selection of these materials as cost effective alternatives to discrete devices in various microelectronic applications.
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New PTC and NTC Thick Film Materials for Gigahertz Range Temperature Variable Attenuators
Feingold, A. H.,Amstutz, P.,Wahlers, R. L.,Huang, C.,Stein, S. J.,Mazzochette, J. 한국마이크로전자및패키징학회 1998 International Symposium on Microelectronics and Pa Vol.1 No.1
Negative temperature coefficient (NTC) and positive temperature coefficient (PTC) thick film thermistor pastes were developed. Using these materials, cost effective Temperature Variable Attenuators (TVA) for use up to 18 GHz are described. these devices maintain the signal level in amplifiers, switches, delay lines, and other microwave and RF signal processing devices. By combining (NTC) and (PTC) thermistors in $quot;T$quot; and $quot;II$quot; configurations, the attenuation changes to compensate for temperature induced signal level changes. Judicious choice of resistance and TCR yields constant impedance over the operating range thus avoiding unwanted signal reflections. While the temperature sensitivity of NTC and PTC clip thermistors is large, their use in TVAs requires a large and expensive inventory to provide the required resistance and TCR values. Thick film thermistor systems were developed to overcome these limitations. These include an NTC materials series with TCR values as high as -500,000 ppm/℃ and resistance range coverage from 100 Ω/sq, to 1M Ω/sq. The complimentary PTC system features linear TCR values of 3000 ppm/℃ and greater with resistance values of 5 to 5000Ω/sq. Process variables for these new thick film thermistor materials are discussed. Attenuation and frequency curves are presented. Impedance match, as characterized by Voltage Standing Wave Ratio (VSWR) versus frequency curves are presented. Current applications include Thermopad^ⓡ type TVA's with improved high frequency performance appropriate for mobile communications and similar uses.
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