Amplifiers – With semiconductor amplifying device – Including signal feedback means
Reexamination Certificate
2008-03-04
2008-03-04
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including signal feedback means
C330S075000
Reexamination Certificate
active
11439789
ABSTRACT:
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.
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Fu Chang-Tsung
Kuo Chien-Nan
Bucknam and Archer
Choe Henry
National Chiao Tung University
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