Oscillator circuit with switchable feedback

Details Oscillator circuit with switchable feedback Oscillator circuit with switchable feedback

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.

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