AWR Success Stories

Sumitomo Electric Designs Compact GaN HEMT Doherty Amplifier

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SUCCESS STORY Sumitomo Electric and Cadence Compact GaN HEMT Doherty Amplifier Using AWR Software Application X Amplifier Software X Cadence ® AWR Design Environment ® Sof tware Por t folio, including: ɢ Cadence AWR ® Microwave Office ® Circuit Design Software ɢ Cadence AWR AXIEM ® Planar Electromagnetic (EM) Simulator Benefits X Ease of use X Speed of simulations X High accuracy X Proficient suppor t ser vices Key Challenges Next-generation 4G/5G telecommunication systems require power amplifiers (PAs) to operate with high efficiency over a wide frequency range in order to provide multiband and multi-standard concurrent operation. In these systems with increased bandwidth and high data rates, the transmitting signal is characterized by high peak-to-average power ratio (PAPR) due to wide and rapid variations of the instanta- neous transmitting power. Therefore, it is important to provide high efficiency at maximum output power and at lower power levels over a wide frequency bandwidth. Sumitomo Electric designers were tasked with developing an innovative high-power, wideband Doherty amplifier covering nearly 1GHz of operation bandwidth at 2.25GHz. The compactness of the design was of critical importance. In addition, low impedance levels from the transistor die to the packaged device gate terminal were required for circuit matching (Figure 1). Figure 1: Equivalent circuit of packaged devices

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