Title :
An 8-20-GHz wide-band LNA design and the analysis of its input matching mechanism
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A wide-band low-noise amplifier (LNA) design is presented with -10 dB input reflection coefficient and 100-K noise temperature over the 8-20-GHz frequency range at room temperature. This LNA can be cooled down in a liquid helium cryostat to have 10-K noise temperature for the purpose of radio-astronomy application. To achieve its wide-band characteristics, a novel input matching mechanism is proposed, which combines the high-frequency inductive feedback and the low-frequency capacitive feedback. The recognition and comprehensive interpretation of this new input matching mechanism is crucial for future development of ultra-wide-band LNAs.
Keywords :
integrated circuit design; microwave amplifiers; wideband amplifiers; 100 K; 8 to 20 GHz; high-frequency inductive feedback; input matching mechanism; input reflection coefficient; liquid helium cryostat; low-frequency capacitive feedback; noise temperature; radio-astronomy application; wide-band LNA design; wide-band low-noise amplifier; Bandwidth; Circuit noise; Feedback; Frequency; Impedance matching; Inductors; Low-noise amplifiers; Resistors; Temperature; Wideband; 65; Input matching; LNA; low-noise amplifier; wide-band;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.837063
