Oscillators – With outer casing or housing – With temperature modifier
Patent
1996-05-16
1997-08-19
Pascal, Robert
Oscillators
With outer casing or housing
With temperature modifier
331 70, 331176, 331158, 310315, 310343, H03B 532
Patent
active
056592701
ABSTRACT:
A substantially sealed frequency source (10) including a crystal oscillator (14) and a programmable IC (22) thermally and electrically coupled on a substrate (12). The IC (22) is accessed through an interface (26) with programming signals (42) so as to provide an analog temperature control signal (34) and a crystal oscillator frequency adjustment signal (36). The substrate (12) maintains a substantially constant temperature at a turning point (82) on a frequency-temperature response curve (80) of the crystal (64). The IC (22) allows programming of the source (10) after sealing to compensate for shifts in the crystal frequency-temperature response (80) due to sealing. The IC (22) provides electrical correction of the substrate temperature setpoint and the crystal oscillator frequency without mechanically or thermally disturbing the internal components of the source (10).
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Millen David W.
Wojewoda Carl
Cunningham Gary
Luu An T.
Mancini Brian
Motorola Inc.
Pascal Robert
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