Browsing by Author "Chien-Nan"

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Circuit and method for implementing frequency tripled I/Q signals
(2010-11-23)
Kuo
;
Chien-Nan
;
Chen
;
Huan-Sheng
A circuit and a method for implementing frequency tripled I/Q signals are proposed, including receiving two input I/Q signals through frequency multipliers so as to generate two frequency multiplied signals and mixing the input I/Q signals and the corresponding frequency multiplied signals through mixers for generating and outputting two I/Q signals with a frequency three times that of the input I/Q signals. The invention eliminates the requirement for high amplitude of the input signals as in the prior art and has lower power consumption and broader bandwidth and can be used as high frequency signal sources in any single chip processes.
Miniature inductor suitable for integrated circuits
(2009-05-12)
Kuo
;
Chien-Nan
;
Ma
;
Chien-Chia
A miniature inductor suitable for integrated circuits comprises a semiconductor substrate having a coplanar strip line and a plurality of metal-insulator-metal (MIM) capacitors, wherein the plurality of MIM capacitors are connected between the transmission lines of the coplanar strip line in parallel, and the coplanar strip line connected with the MIM capacitors further comprises a crossed planar strip line structure or a shifted planar strip line structure. The present invention reduces the occupied area for an inductor by adding the MIM capacitors and folding the transmission lines, and alleviates the quality factor degradation of the inductor caused by substrate loss.
Ultra broad-band low noise amplifier utilizing dual feedback technique
(2008-03-04)
Fu
;
Chang-Tsung
;
Kuo
;
Chien-Nan
This invention relates to a low noise amplifier, used in radio frequency integrated circuit design, especially low noise amplifiers for ultra broad-band wireless communication, comprising at least a transistor of the core circuit of a low noise amplifier structure, a transformer that is implemented on the chip, in order to form a dual feedback amplifier, that is, an amplifier structure comprising an inductive feedback and a capacitive feedback, wherein the capacitive feedback is used for the low and medium frequency range, while the inductive feedback is used for the high frequency range. By assembling an amplifier circuit with these two feedback paths, it is possible to provide a broadband and good impedance matching at the signal input end of the circuit. The low noise amplifier circuit structure of the present invention is able to provide optimal conditions for broadband input impedance matching and broadband noise optimum; besides significantly increasing the gain and gain flatness, there are also huge improvements to the noise performance and the cost-down on fabrication, and the energy consumption can also be maintained at a very low level.