TY - GEN
T1 - The effect of baseband impedance termination on the linearity of GaN HEMTs
AU - Akmal, M.
AU - Lees, J.
AU - Bensmida, S.
AU - Woodington, S.
AU - Carrubba, V.
AU - Cripps, S.
AU - Benedikt, J.
AU - Morris, K.
AU - Beach, M.
AU - McGeehan, J.
AU - Tasker, P. J.
PY - 2010
Y1 - 2010
N2 - This paper demonstrates the significant effect of baseband impedance termination on the linearity performance of a 10W GaN HEMT device driven to deliver a peak envelope power of approximately 40dBm. The paper also proposes a further refinement to a state-of-art active IF load-pull measurement system to allow the precise independent control of all significant baseband components generated as a result of the multi-tone excitation used. The presentation of specific baseband impedances has delivered a 20dBc and 17dBc improvement in IM3 and IM5 inter-modulation products respectively, relative to the case of a classical, ideal short circuit. As expected for this device, this was achieved by emulating appropriate negative impedances lying outside of the Smith chart, and when this observation is considered alongside the Envelope Tracking PA architecture, this raises the interesting possibility of significantly improving PA linearity using the very mechanisms that are employed to improve PA efficiency.
AB - This paper demonstrates the significant effect of baseband impedance termination on the linearity performance of a 10W GaN HEMT device driven to deliver a peak envelope power of approximately 40dBm. The paper also proposes a further refinement to a state-of-art active IF load-pull measurement system to allow the precise independent control of all significant baseband components generated as a result of the multi-tone excitation used. The presentation of specific baseband impedances has delivered a 20dBc and 17dBc improvement in IM3 and IM5 inter-modulation products respectively, relative to the case of a classical, ideal short circuit. As expected for this device, this was achieved by emulating appropriate negative impedances lying outside of the Smith chart, and when this observation is considered alongside the Envelope Tracking PA architecture, this raises the interesting possibility of significantly improving PA linearity using the very mechanisms that are employed to improve PA efficiency.
UR - https://www.scopus.com/pages/publications/78650037297
M3 - Conference contribution
AN - SCOPUS:78650037297
SN - 9782874870163
T3 - European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010
SP - 1046
EP - 1049
BT - European Microwave Week 2010, EuMW2010
T2 - 13th European Microwave Week 2010, EuMW2010: Connecting the World - 40th European Microwave Conference, EuMC 2010
Y2 - 28 September 2010 through 30 September 2010
ER -