Advances in ultra-high linearity E-Mode GaAs PHEMT MMIC amplifiers for use in broadband, high dynamic range applications using complex digital waveforms

Recent advances in MMIC GaAs PHEMT amplifiers have pushed intermodulation (IM) distortion performance beyond the traditional relationship between intercept point and compressed output power levels making them ideal candidates for use in broadband digital transmission using complex modulation such as OFDM and QAM. Single-ended and push-pull structures have improved IP3 and IP2 performance; however, real benefits are exemplified when characterized for ACPR, EVM and MER. This paper will discuss the performance of a variety of MMIC amplifier designs based upon E-Mode PHEMT technology and the method to characterize these amplifiers for applications that employ complex digital modulation.