Parasitic aware impedance matching techniques for RF amplifiers

Dasgupta, K and Dutta, Asudeb and Bhattacharyya, T K (2012) Parasitic aware impedance matching techniques for RF amplifiers. Analog Integrated Circuits and Signal Processing, 70 (1). pp. 91-102. ISSN 0925-1030

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Abstract

This paper analyzes the impact of non-idealities of the lumped passive elements (inductor and capacitor) in the matching networks of RF amplifiers. This work infers that the representation of performance matrices of a matching network like sensitivity and harmonic rejection; in terms of input reflection coefficient (S 11) is more convenient than the transfer functions. Expression of S 11 of widely used L-, π- and T-networks have been derived as a function of inductor quality factor (Q L ), capacitor quality factor (Q C ) and transformation ratio. This formulation shows that the matching performance degrades severely due to component non-idealities. To circumvent this degradation, a modified set of design equations have been proposed for the L-network and the same has been extended for π- and T-network. Simulation results show that network synthesized on the basis of proposed set of equations nullify the effect of non-idealities by 70–80% in L-network and 10–20% in π-network but minor improvement in T-network.

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