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In this paper, a three stages monolithic low noise amplifier for T/R module application is presented. This amplifier is fully integrated on 0.15 µm GaAs pHEMT technology and achieves a wide bandwidth from 6 to 11 GHz. Within this band, the LNA has the minimum of 1.3 dB noise figure and over 25 dB small signal gain. The output third-order intercept point is over 30 dBm and the 1 dB compression point (P1dB) is 16 dBm at the output. | Journal of Science and Technology 54 (5) (2016) 584-590 DOI: 10.15625/0866-708X/54/5/6978 BROADBAND GaAs pHEMT LNA DESIGN FOR T/R MODULE APPLICATION Le Dai Phong1,*, Vu Duy Thong2, Pham Le Binh3 1 2 Institute of System Integration, Le Quy Don Technical University, 236 Hoang Quoc Viet Street, Bac Tu Liem, Hanoi, Vietnam Department of Electronics and Computer Engineering, VNU University of Engineering and Technology, 144 Xuan Thuy Street, Cau Giay, Hanoi, Vietnam 3 Vimmics, 466/4 Le Quang Dinh, Binh Thanh, Ho Chi Minh city * Email: phongld@mta.edu.vn Received: 16 September 2015; Accepted for publication: 1 June 2016 ABSTRACT In this paper, a three stages monolithic low noise amplifier for T/R module application is presented. This amplifier is fully integrated on 0.15 µm GaAs pHEMT technology and achieves a wide bandwidth from 6 to 11 GHz. Within this band, the LNA has the minimum of 1.3 dB noise figure and over 25 dB small signal gain. The output third-order intercept point is over 30 dBm and the 1 dB compression point (P1dB) is 16 dBm at the output. Keywords: LNA; T/R Module; X-Band; MMIC; GaAs; radar; integrated circuit. 1. INTRODUCTION Transmit/receive module (T/R module) is one of the most important elements in a radar system. A phased array antenna in a radar system uses thousands of such T/R modules. Figure 1 shows a block diagram of a T/R module. For the receiving function of T/R module, a low noise amplifier (LNA) is the key component that affects a lot of important system parameters such as noise figure (NF), gain, bandwidth (BW), spurious free dynamic range (SFDR), and spectral purity. The emerging in applications of radar systems, especially at X-band and Ku-band frequencies, necessitates wide frequency range, low noise, high gain, and high power T/R modules. Hence, a low noise, wideband, high gain, and high power LNA is highly demanded for next generation radar systems. Recently, there are a lot of publications about X-band LNA. Some of them were
