A 27 dBm microwave amplifier with varactors-controlled matching networks

摘要

In this paper design and development of 27dBm medium-power amplifier with varactor-based input/output matching networks is presented. The frequency tunable range of 1.3GHz to 2.6GHz was obtained for input matching |Γ| ≤ 0.3 and power gain higher then 13dBm. Adaptive impedance matching networks provide frequency adjustment and output power level optimization by means of two voltages control. The amplifier was fabricated using surface mounted technology and conventional low-cost GaAs transistor and hyperabrupt varactors. Main parameters of the implemented amplifier with nonlinear behaviour of varactors are investigated. The device can be applied to operation with constant envelope multi-standard and multi-band radio-communication systems.