Oscillators – Amplitude control or stabilization – Automatic
Reexamination Certificate
2005-09-13
2005-09-13
Mis, David (Department: 2817)
Oscillators
Amplitude control or stabilization
Automatic
C331S074000, C331S1160FE, C331S158000, C331S173000, C331S17700V, C331S17700V
Reexamination Certificate
active
06943639
ABSTRACT:
A high accuracy crystal oscillator for generating a clock signal comprises a gain stage (2) controlled by a current from a current source (5), and a trimmable load capacitance (3, 4). To generate a low power clock signal, a mode control unit (7) is provided for disconnecting at least part of the load capacitance (3, 4) and activating an oscillation amplitude regulator (6) that is connected between the input terminal of the gain stage (2) and the current source (5) to reduce the current to the gain stage (2) to such a value that oscillation is maintained with a minimum amplitude.
REFERENCES:
patent: 4782309 (1988-11-01), Benjaminson
patent: 6052036 (2000-04-01), Enstrom et al.
patent: 09-102714 (1997-04-01), None
patent: 2000-010651 (2000-01-01), None
patent: 2002-091606 (2002-03-01), None
Baker & Botts L.L.P.
Infineon - Technologies AG
Mis David
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