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Monolithic RC Filters

IP.com Disclosure Number: IPCOM000080162D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Wright, WL: AUTHOR

Abstract

Reliable precision RC networks for low-frequency filters and other precision analog circuit components may be fabricated as monolithic structures, using multilayer ceramic and thick film technologies.

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Monolithic RC Filters

Reliable precision RC networks for low-frequency filters and other precision analog circuit components may be fabricated as monolithic structures, using multilayer ceramic and thick film technologies.

A monolithic capacitor is fabricated by firing a plurality of metallized ceramic layers to form an integral structure. In one form, the ceramic may be barium titinate and the metallization may be a thin film metallurgy or a thick film metallization, e.g., platinum/palladium. The metallization is deposited in a form factor to have a plurality of tab portions 12, as shown in Figs. 1 and 2.

Electrodes 14 on one edge of the structure 10 interconnect the various metallized layers, as shown in Fig. 3. Electrodes 14 are brought to the top and bottom surfaces of the structure 10.

A conductive pattern 16 is formed on the bottom surface to interconnect the tab members 12 of the electrode plates. The pattern 16 interconnects the electrodes 14 to obtain the desired capacity. as shown in Fig. 4. The dielectric thickness, dielectric constant, number of layers and other parameters permit a wide range of capacitance values to be obtained. Also a plurality of capacitors can be formed in the structure, as shown by capacitors C1, C2 and C3 in Fig. 1. The capacitance may be trimmed, as desired, by cutting the various electrodes
14.

Thick-film resistors and conductors, not shown, are formed on the top surface of the structure 10, and connected to the capacitors, to...