Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
2007-05-15
2007-05-15
Kinkead, Arnold (Department: 2817)
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
C331S167000, C331S1170FE, C331S1170FE, C331S03600C
Reexamination Certificate
active
10685030
ABSTRACT:
An LC circuit section and a negative resistance section are provided for an LC-VCO. A pair of output terminals are provided for the LC circuit section and an inductor is connected between the output terminals, and two variable capacitors are connected in series to each other parallelly with the inductor. Further, the LC circuit section is provided with a pair of capacitors and a pair of switches that are connected between the capacitors and a ground potential and consist of NMOS transistors. Moreover, a switch that consists of the NMOS transistor is connected between a node, which is between one capacitor and one switch, and a node, which is between the other capacitor and the other switch, and the two nodes are connected to each other when the switch is closed.
REFERENCES:
patent: 7019598 (2006-03-01), Duncan et al.
patent: 11-330852 (1999-11-01), None
patent: 2001-203603 (2001-07-01), None
Sjoland, H., Improved Switched Tuning of Differential CMOS VCOs, IEEE Tranactions on Circuits and Systems II, Analog and Digital Signal Processing, U.S.A., May 2002, vol. 49, Issue 5, pp. 352-355.
A. Kral, et al., “RF-CMOS Oscillators with Switched Tuning”, IEEE (1998), pp. 555-558.
Kinkead Arnold
NEC Electronics Corporation
Scully , Scott, Murphy & Presser, P.C.
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