Design Of Wideband Low Noise Amplifier

Yong, Kok Sheng (2012) Design Of Wideband Low Noise Amplifier. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Today, wideband amplifier design remains one of the most challenging portions in the communication system. The conventional low noise amplifier operates on a single band, in which it is easier to design the amplifier to meet the entire specified goal. However, MOTOROLA wideband low noise amplifier which operate from 100 MHz to 1 GHz, making it harder to design as to operate at wider spectrum while maintaining low noise < 1.5 dB, great input and output return loss <-10dB, good gain > 15 dB with reverse isolation of < -20 dB with restriction of low power consumption < 1.8 V and < 10 mA, thus presenting a tougher challenge for the designer to achieve the goals for the extended frequency range. Traditional methods of tuning and tweaking will require more tedious and time consuming effort to cover the wider frequency range, thus rendering the methods to be impractical. Therefore, a more specific technical approach must be utilized to help the designers to better design the broadband amplifier. This research paper represents the amplifier requirements in wideband application and proposed a structured practical design approach which utilizes the feedback topology by using Advanced Design System (ADS) simulations in optimizing the amplifier to meet all the required specs. The best performance design is fabricated on a FR4 strip board and the performance of designed amplifier was verified using network analyzer. The fabricated LNA exhibits a signal gain of more than 17 dB, NF of less than 1 dB, IIP3 of more than 10 dBm and has been maintained unconditional stable throughout the frequency of interest.

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