A 0.5 to 6 GHz wideband cascode LNA with enhanced linearity by employing resistive shunt‐shuntfeedback and derivative superposition. Issue 10 (13th May 2020)

• Record Type: Journal Article
• Authors: Li, Zhenrong; Wang, Simin; Li, Zhen; Tang, Hualian; Zhuang, Yiqi
• Is Part Of: Microwave and optical technology letters. Volume 62:Issue 10(2020:Oct.)
• Page Start: 3157
• Page End: 3162
• Publication Date: 2020-05-13
• Subjects: derivative superposition -- emitter degeneration RC parallel network -- linearity -- low‐noise amplifier (LNA) -- resistive shunt‐shunt feedback -- SiGe HBT; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.32435
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: A wideband bipolar low‐noise amplifier (LNA) with enhanced linearity operating in 0.5 to 6 GHz frequency range is proposed in this letter. The LNA design is based on a cascode amplifier with an emitter degeneration RC parallel network and a resistive shunt‐shunt feedback which can improve linearity. The cascode topology in conjunction with the preceding series inductor L is utilized to achieve good wideband input impedance matching, while the wideband output impedance matching is realized by using an emitter follower as a buffer. And the third‐order input intercept point (IIP3) has been improved due to the derivative superposition technique. The wideband LNA presented in this letter was designed and implemented in a JAZZ 0.18 μm SiGe BiCMOS process. The measured results show that from 500 MHz to 6 GHz, the power gain ( S 21 ) is 16.5 to 17.1 dB, the noise factor (NF) is 2.7 to 3.3 dB, the current consumption without buffer stage is 12.4 mA at a 3.3 V supply voltage, and the IIP3 is −0.834 dBm at 2 GHz. The chip size is 1.06 × 0.64 mm 2 .