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摘要:
A novel ultra-wideband (UWB) SiGe HBT low noise amplifier (LNA) with resistive feedback was designed. Due to absence of the inductor which occupies a large chip area, the total die area and the fabrication cost of the amplifier are reduced noticeably. In feedback loops of the novel amplifier, compound distributed resistors and a DC capacitor are used instead of a traditional single resistor. In this way, the output impedance matching of the novel LNA can be improved greatly only by adjusting the resistor that is in series with a capacitor, without sacrificing of biasing conditions. The layout area of the novel resistive feedback LNA is only 0.144 mm2. The simulation results indicate that, in the band of 3.1-10 GHz, the novel UWB LNA achieves the low noise figure (NF) of less than 4.5 dB, the gain of as high as 27 dB with variation of only 1.032 dB, the voltage standing wave radio of less than 1.637 and the stability factor of more than 2.3. The results are of great practical importance, because they provide a guide for the design and development of the low-cost and high performance monolithic UWB LNA.
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