META 2021, META'12

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Microwave NGD circuit using LNA
Blaise Ravelo

Last modified: 2012-01-06


In this letter, a negative group delay (NGD) circuit topology comprised of a low noise amplifier associated with RLC-series resonant network operating at RF/microwave frequencies is investigated. The theoretical approach illustrating the functioning of the NGD circuit proposed is established by considering the amplifier S-parameters. Synthesis relations enabling to choose the NGD device parameters according to the desired NGD value and S-parameters are also established. To demonstrate the relevance of the theoretic concept, a microwave device exhibiting NGD function at around 1.25 GHz was designed and tested. The major benefit of the NGD device proposed is that it is capable to exhibit positive transmission gain and faculty of biasing and matching in the NGD bandwidth.


Negative group delay, LNA, microwave circuit