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This paper presents a V‐band digitally controlled low noise variable gain amplifier (LNVGA) in 28‐nm bulk CMOS process. The amplifier includes three stages and the first stage is used to realize wideband high gain and low noise figure (NF). The gain control is implemented in the second and third stages with current steering and split cascode topology, respectively. A source degeneration inductor and a series inductor are introduced to reduce the phase variation in the second stage. The phase response function is analyzed, and the phase reduction of 1.2° is achieved. Moreover, with the combination of these two different topologies, the phase variation can be further reduced. The measurement results show the LNVGA has a peak gain of 16 dB with a 3‐dB bandwidth of 45–59 GHz. The measured gain control range is 0–16 dB in 16 different gain states and the minimum phase variation is 3.5° with power consumption of 23 mW. [ABSTRACT FROM AUTHOR]

Moreover, they are particularly grateful to the authors of all the submitted papers for their efforts and contributions to this Special Issue, and to the reviewers for devoting their valuable time and expertise to review the submitted manuscripts. Authors of the accepted and presented papers during the iWEM 2021 were invited to submit expanded versions of their conference papers in this special issue. This special issue of Microwave and Optical Technology Letters (MOTL) includes nine expanded papers from the 2021 IEEE International Workshop on Electromagnetic: Applications and Student Innovation Competition (IEEE iWEM2021). [Extracted from the article]

ABSTRACT In this paper, we present a compact tri-band bandpass filter (BPF). The resonator, which consists of a main transmission line, a center-loaded open stub and a side-loaded open stub, is utilized to obtain the three resonance frequencies. After selecting the impedance of each stub at this resonator, the passband frequencies can be controlled individually. Four transmission zeros are generated to enhance the selectivity. For demonstration, a compact tri-band BPF is implemented. Good agreement between the measured and simulated results is presented to verify the theoretical predication. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:573-577, 2016 [ABSTRACT FROM AUTHOR]