Back to results
US 4,470,096 AGranted
Multilayer, fully-trimmable, film-type capacitor and method of adjustment
AssigneeMotorola, Inc.
InventorPatrick W. Guertin
Life of this patent
Estimating the term…
Abstract
A thick film capacitor with more than two layers configured to enable trimming of the lower layers to increase the capacitance per area ratio while maintaining a linear trimmability of the capacitor's complete range.
Claims10
The process of forming a capacitor on an insulating substrate comprising the steps of:
- (a) depositing a first metallic layer, having a terminal at one end, on said insulating substrate;
- (b) depositing a first layer of insulating dielectric material over said first metallic layer;
- (c) depositing a plurality of intermediate metallic layers, each separated by an insulating dielectric layer, over said first dielectric layer, wherein each of said intermediate metallic layers is configured as segmented finger-like electrodes partially exposed and intercoupled at one end, and wherein alternate metallic layers are coupled to the terminal of said first plate-like metallic layer;
- (d) depositing a topmost plate-like metallic layer, having a terminal at one end, over said intermediate metallic layers, wherein said terminal is further coupled to the other alternate intermediate metallic layers;
- (e) depositing a coating of insulating material over the assembled capicator;
- (f) adjusting the capacitance of said capacitor by isolating each segmented finger-like electrode until a desired capacitance is achieved;
- and
- (g) further trimming the topmost metallic layer of the capacitor if trimming of the segmented layers did not achieve the desired capicitance.
5 more elements
A multilayer trimmable capacitor comprising:
- (a) an insulating substrate;
- (b) a plurality of metallic layers on said substrate interspersed with insulating dielectric layers;
- the intermediate metallic layers having segmented finger-like electrodes partially exposed and intercoupled on one side, wherein the topmost metallic layer and the bottommost layer have terminals which are alternately coupled to said intermediate metallic layers;
- (c) said exposed segmented finger-like electrodes being adapted for severing to alter the observed capacitance of the assembled capacitor;
- and
- (d) a coating of passivating material covering said capacitor.
3 more elements
Dependencies are inferred from the claim text.