Abstract
A broadband switch-less bi-directional low noise amplifier based on negative group delay (NGD) matching circuits with a non-Foster characteristic is proposed. To validate the feasibility, two circuits were designed and compared, which are matched by NGD circuits and traditional lumped elements respectively. The structure proposed in this paper has a measured relative bandwidth (RBW) of 32.6% rather than 5.1% for the traditional one. From 797 MHz to 1095 MHz, the input and output return losses (RL) are more than 10 dB with a noise factor (NF) of about 3.5 dB and peak gain of 12.2 dB. Meanwhile, the reverse isolation and stability factor (SF) are greater than 20 dB and 1, respectively. The group delay (GD) value is 0.5 ns ± 0.25 ns in the operating frequency band, which is much flatter and lower compared to that of the traditional one.
Highlights
In recent years, wireless communication systems have been rapidly developed, in which amplifiers are required to improve system performance
In Reference [7], resistors were added to a matching network to increase the input and output return losses (RL)
Matching network is the negative group delay (NGD) circuits used as matching networks are analyzed in Section 2, in Section 3 a switch-less presented, Section discusses the results of simulations and measurements, and conclusions are bi-directional low noise amplifier with NGD matching network is presented, Section 4 discusses the drawn of in simulations
Summary
Wireless communication systems have been rapidly developed, in which amplifiers are required to improve system performance. NGD networks canRLC be classified as [11,12], finite unloaded quality-factor resonators [13], the feedback loop technique [14], or[11,12], signal passive and active circuits. Passive In on RLC resonators are more suitable for resonator is proposed to achieve broadband matching of a switch-less bi-directional amplifier. With matching network is the NGD circuits used as matching networks are analyzed, in Section 3 a switch-less presented, Section discusses the results of simulations and measurements, and conclusions are bi-directional low noise amplifier with NGD matching network is presented, Section 4 discusses the drawn of in simulations.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
