Title:
VOLTAGE CONTROLLED OSCILLATOR
Document Type and Number:
Japanese Patent JP3892383
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator which has a small size and a large oscillating frequency variable width.
SOLUTION: An LC-VCO 1 includes a negative resistance section 2, an LC circuit 4, and a negative resistance section 3. The circuit 4 has output terminals 7, 8, an inductor 9 connected between the terminals 7 and 9, and variable capacitors 10, 11 connected in series with each other in parallel with the inductor 9. Switches 14, 15 consisting of capacitors 12, 13 and a NMOS are provided in the LC circuit 4. Further, a switch 19 made of a NMOS is connected between a node N1 between the capacitor 12 and the switch 14 and a node N2 between the capacitor 13 and the switch 15. When the switch 19 is closed, the node N1 is connected to the node N2 each other.
Inventors:
Yoshinori Muramatsu
Application Number:
JP2002301062A
Publication Date:
March 14, 2007
Filing Date:
October 15, 2002
Export Citation:
Assignee:
NEC Electronics Corporation
International Classes:
H03B5/12; H03B1/00; (IPC1-7): H03B5/12
Domestic Patent References:
| JP11330852A |
Other References:
Kral, A.; Behbahani, F.; Abidi, A.A.,'RF-CMOS oscillators with switched tuning',Custom Integrated Circuits Conference, 1998., Proceedings of the IEEE 1998,米国,1998年 5月14日,Page(s):555 - 558
Sjoland, H.,'Improved switched tuning of differential CMOS VCOs',IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing,米国,2002年 5月,Volume 49, Issue 5,Page(s):352 - 355
Sjoland, H.,'Improved switched tuning of differential CMOS VCOs',IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing,米国,2002年 5月,Volume 49, Issue 5,Page(s):352 - 355
Attorney, Agent or Firm:
Masanori Fujimaki