Method of making compensated crystal oscillator

Details Method of making compensated crystal oscillator Method of making compensated crystal oscillator

1986-08-26

1988-06-14

Hall, Carl E.

Metal working

Piezoelectric device making

310344, H01L 4122

Patent

active

047502460

ABSTRACT:
Ceramic package (10) for compensated crystal oscillator has a three-layer body with a closed bottom upper cavity (24), a closed bottom lower cavity (38), and a through cavity (44) in which is mounted oscillator crystal. The upper cavity carries oscillator network on thin film hybrid (68) while the lower cavity carries the temperature compensation network on thick film hybrid (70). After the components are installed and connected, the oscillator network is adjusted, and then the crystal is adjusted in vacuo. The crystal cavity is closed with thermocompression bonded covers to maintain the vacuum and the oscillator network cavity is filled with dry inert gas and is sealed by attaching a cover by thermocompression bonding. With both cavities sealed, the compensator network is adjusted as required. Thereupon, the compensation network is also covered and hermetically sealed.

REFERENCES:
patent: 4445256 (1984-05-01), Huguenin et al.

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