| US 7,414,490 B2 | ||
| Dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing | ||
| Sang-yoon Jeon, Seoul (Korea, Republic of); Heung-bae Lee, Suwon-si (Korea, Republic of); Seong-soo Lee, Suwon-si (Korea, Republic of); Jinup Lim, Seoul (Korea, Republic of); and Joongho Choi, Seoul (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwon-si (Korea, Republic of) | ||
| Filed on Nov. 29, 2005, as Appl. No. 11/288,212. | ||
| Claims priority of application No. 10-2005-0008613 (KR), filed on Jan. 31, 2005. | ||
| Prior Publication US 2006/0170512 A1, Aug. 03, 2006 | ||
| Int. Cl. H03B 5/12 (2006.01) | ||
| U.S. Cl. 331—179 [331/2; 331/46; 331/49; 331/56; 331/186] | 8 Claims |
| 1. A dual-band voltage-controlled oscillator, comprising:
a power supply unit for supplying a source voltages;
plural voltage-controlled oscillation units for outputting different oscillation frequencies according to controls of a certain
tuning voltage;
plural bias units for generating driving voltages for driving the voltage-controlled oscillation units and supplying the driving
voltages to the voltage-controlled oscillation units; and
plural buffers for selectively outputting oscillation frequencies of the plural voltage-controlled oscillation units,
wherein the plural buffers are turned on and selectively output an oscillation frequency of a corresponding voltage-controlled
oscillation unit if a voltage of a first logic level is supplied from the power supply unit.
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