Oscillators – With frequency calibration or testing
Reexamination Certificate
2006-05-02
2006-05-02
Mis, David (Department: 2817)
Oscillators
With frequency calibration or testing
C331S1160FE, C331S158000, C331S175000
Reexamination Certificate
active
07038549
ABSTRACT:
An oscillator circuit includes a pair of external terminals to which an external resonator is connected, an inverter connected between the external terminals, and an internal feedback path paralleling the inverter between the external terminals. An internal switching element enables the internal feedback path to be opened so that leakage current at the external terminal connected to the input end of the inverter can be measured accurately. Further internal switching elements are preferably provided so that the resistance of the internal feedback path can be switched. The internal feedback path may include one or more resistors, or the internal switching elements themselves may have sufficient on-resistance to function as resistors.
REFERENCES:
patent: 4704587 (1987-11-01), Ouyang et al.
patent: 4918408 (1990-04-01), Sakihama et al.
patent: 5025230 (1991-06-01), Kondo et al.
patent: 5923222 (1999-07-01), Russell et al.
patent: 5982246 (1999-11-01), Hofhine et al.
T. Inaba,Hasshin Kairo no Sekkei to Oyo CQ,1993, p. 157, w/Explanation.
Mis David
Nixon & Peabody LLP
Oki Electric Industry Co. Ltd.
Studebaker Donald R.
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