A Broadband Multistage LNA With Bandwidth and Linearity Enhancement

作者：Nikandish Gholamreza^*; Yousefi Alireza; Kalantari Milad

来源：IEEE Microwave and Wireless Components Letters, 2016, 26(10): 834-836.

DOI：10.1109/LMWC.2016.2605446

• Bandwidth enhancement
• broadband amplifier
• feedback amplifier
• low-noise amplifier (LNA)
• monolithic microwave integrated circuit (MMIC)

Design techniques to enhance bandwidth and linearity of broadband multistage low-noise amplifiers (LNAs) are presented. A feedback amplifier circuit is proposed to compensate for transistor gain roll-off with frequency in other amplifier stages and extend overall bandwidth. Moreover, a transistor width tapering in a multistage LNA is applied to improve linearity. These techniques are adopted in a three-stage monolithic microwave integrated circuit (MMIC) LNA implemented in a 0.1-mu m GaAs pHEMT process. The LNA features 18-43 GHz bandwidth, 21.6 dB average gain, and 1.8-2.7 noise figure (NF). It exhibits output 1-dB compression point of 11.5 dBm at 30 GHz and consumes 70 mA bias current from a 2-V supply.

• 出版日期2016-10