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Browse Prior Art Database

TEMPERATURE COMPENSATED CRYSTAL REELED FOR AUTOMATION

IP.com Disclosure Number: IPCOM000005934D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-16
Document File: 1 page(s) / 47K

Publishing Venue

Motorola

Related People

Michael M. Hoghooghi: AUTHOR [+2]

Abstract

The idea is to be able to present a variety of tight tolerance crystals, along with their temperature compensation components, for an automated manufacturing process with the least amount of complication. The existing bag setup techniques require operator assistance and/or very sophisticated vision systems.

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Technical Developments Volume 10 March 1990

TEMPERATURE COMPENSATED CRYSTAL REELED FOR AUTOMATION

by Michael M. Hoghooghi and Thomas Nolan

   The idea is to be able to present a variety of tight tolerance crystals, along with their temperature compensation components, for an automated manufacturing process with the least amount of complication. The existing bag setup techniques require operator assistance and/or very sophisticated vision systems.

   The temperature compensated cr@al oscillators are typically less expensive than their uncompensated counter- parts. Furthermore; certain cuts of crystals, depending on temperature ranges and tolerance requirements, can not be obtained in an uncompensated format at high volumes. The +25ppm 4.2MH.z AT-cut reference crystal required for the 9OOMHz paging receivers is a prime candidate for this environment.

   A typical temperature compensated crystal oscillator requires a temperature compensation capacitor, and a ther- mistor. In a bag setup scenario, the components are color-coded for matching purposes and bagged by the supplier prior to shipment to the factory.

   The purposed solution will replace the "bag" with a dual or triple pocket tape. This will provide an automated alter- native to the manual manufacturing processes of today. The crystals would be designed into a surface-mounted package along with their temperature compensation network, also in SMT format, and will be presented to the robot for place- ment. Figur...