Our client is looking for a Principal RF Engineer / RF Amplifier Specialist to join their system team as a technical specialist involved in research and development of high power RF amplifiers incorporating Envelope Tracking technology. Experience of high power RF design using LDMOS and GaAs transistors is essential, as is a good knowledge of modern amplifier design and familiarity in efficiency enhancement techniques. The successful candidate will demonstrate most of the following skills / experience: Experience of 1-3GHz high power single ended and/or balanced linear RF amplifiers using LDMOS and/or GaAs devices, an understanding of gain/efficiency/ linearity design trade-offs and design optimisation techniques, knowledge of load pull and efficiency enhancement techniques such as Doherty amplifiers and Class F operation, familiarity with RF linear and non-linear simulation e.g. ADS, MWO, as well as a thorough understanding of low impedance matching techniques using microstrip transmission lines.