Oscillators – With frequency adjusting means – Step-frequency change
Reexamination Certificate
2007-06-05
2007-06-05
Chang, Joseph (Department: 2817)
Oscillators
With frequency adjusting means
Step-frequency change
C331S1170FE
Reexamination Certificate
active
11292546
ABSTRACT:
The present invention is related with a dual-band LC voltage controlled oscillator, which utilizes a substantial amount of feedback loop paths in the circuit. The circuit is a core of a substantial amount of communication ICs. The voltage controlled oscillator can provide wide-band or dual-band radio frequency generation, and it utilizes a switch controlled circuit to select one of the feedback loops in order to choose the assigned frequency band output. Generic wide-band or dual-band LC voltage controlled oscillations are obtained by switching parallel-connected capacitors or switching inductor array, in contrast, the present invention is used for switching several parallel connected feedback loops, each of which associated with an LC tank forms an oscillation frequency output. Utilizing the switch to control the feedback loop and integrating different band oscillator circuit is capable of saving chip's size and power consumption.
REFERENCES:
patent: 5872489 (1999-02-01), Chang et al.
patent: 6853257 (2005-02-01), Yonekawa et al.
patent: 2002/0125958 (2002-09-01), Ikarashi
Jang Sheng-Lyang
Lee Shao-Hua
Chang Joseph
National Taiwan University of Science and Technology
Thomas Kayden Horstemeyer & Risley
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