Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
2004-11-18
2009-02-03
Kinkead, Arnold (Department: 2817)
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
C331S016000, C331S034000, C331S185000
Reexamination Certificate
active
07486152
ABSTRACT:
The cathode of a first varactor diode (VD1) is connected to a resonator element (XD) of an oscillator (2) via a capacitor (C1) and is connected to a triangular wave generator circuit (3) via an inductor (RFC1) and a resistor element (R1), whereas the anode is connected to the cathode of a second varactor diode (VD2) via a capacitor (C2) and is grounded via an inductor (RFC3). The cathode of a zener diode (ZD1) is connected to a node of the inductor (RFC1) and the resistor element (R1), whereas the anode is grounded via a resistor element (R2). The cathode of the second varactor diode (VD2) is connected to a node of the zener diode (ZD1) and the resistor element (R2) via an inductor (RFC2), whereas the anode is grounded. In other embodiments, certain component(s) may be omitted and/or a fixed supply potential may be substituted for the ground potential.
REFERENCES:
patent: 3614649 (1971-10-01), Gerig
patent: 3619803 (1971-11-01), Klein
patent: 4297655 (1981-10-01), Fujii et al.
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International Search Report dated Mar. 28, 2005.
Kinkead Arnold
Murata Manufacturing Co. Ltd.
Ostrolenk Faber Gerb & Soffen, LLP
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