Variable oscillator

Details Variable oscillator Variable oscillator

2005-11-22

2005-11-22

Feild, Joseph (Department: 2681)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S265000, C455S261000, C455S262000, C455S255000, C455S278100, C455S231000, C455S208000, C455S166200, C455S326000, C455S193300, C326S098000, C331S1160FE, C331S00100A

Reexamination Certificate

active

06968168

ABSTRACT:
A variable frequency oscillator comprising: an oscillatory circuit for generating a periodic output dependent on the capacitance between a first node and a second node of the circuit, and having a capacitative element connected between the first node and the second node; the capacitative element comprising: a variable capacitance unit, the capacitance of which is variable for varying the frequency of the output and a plurality of finite capacitances each being selectively connectable in parallel with the variable capacitance unit between the first node and the second node to trim the frequency of the output.

REFERENCES:
patent: 5625325 (1997-04-01), Rotzoll et al.
patent: 5686864 (1997-11-01), Martin et al.
patent: 5880643 (1999-03-01), Bjork et al.
patent: 6172576 (2001-01-01), Endo et al.
patent: 6377315 (2002-04-01), Carr et al.
patent: 6426680 (2002-07-01), Duncan et al.
patent: 0 720 299 (1996-07-01), None
patent: 2 612 017 (1988-09-01), None
patent: 2 120 478 (1983-11-01), None

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