TY - GEN
T1 - A LSNA configured to perform baseband engineering for device linearity investigations under modulated excitations
AU - Ogboi, F. L.
AU - Tasker, P. J.
AU - Akmal, M.
AU - Lees, J.
AU - Benedikt, J.
AU - Bensmida, S.
AU - Morris, K.
AU - Beach, M.
AU - McGeehan, J.
PY - 2013
Y1 - 2013
N2 - A Large Signal Network Analyzer (LSNA) system has been configured to automatically engineer specific baseband voltage waveforms that, when injected into the output of an active device enable novel device linearization investigations. This is achieved using a formulation, generalized in the envelope domain, to describe the required baseband injection voltage. The advantage of this formulation is that it can be used to compute and then engineer the required baseband injection voltage signals, for arbitrary amplitude modulated envelopes, in terms of a limited set of describing coefficients. Using this approach, it is possible to determine the optimum baseband signal coefficients necessary to linearize a 10W Cree GaN HEMT device using baseband injection techniques. The formulation is validated by experimental investigation, using a 3-tone modulated signal, where the optimum output baseband signal for third and fifth order IMD suppression is successfully identified. For the optimum case, the observed level of IM3 and IM5 distortion was reduced to less than -56dBc whilst driving into 1.5 dB of compression.
AB - A Large Signal Network Analyzer (LSNA) system has been configured to automatically engineer specific baseband voltage waveforms that, when injected into the output of an active device enable novel device linearization investigations. This is achieved using a formulation, generalized in the envelope domain, to describe the required baseband injection voltage. The advantage of this formulation is that it can be used to compute and then engineer the required baseband injection voltage signals, for arbitrary amplitude modulated envelopes, in terms of a limited set of describing coefficients. Using this approach, it is possible to determine the optimum baseband signal coefficients necessary to linearize a 10W Cree GaN HEMT device using baseband injection techniques. The formulation is validated by experimental investigation, using a 3-tone modulated signal, where the optimum output baseband signal for third and fifth order IMD suppression is successfully identified. For the optimum case, the observed level of IM3 and IM5 distortion was reduced to less than -56dBc whilst driving into 1.5 dB of compression.
KW - Multi-tone modulation
KW - baseband
KW - linearization
KW - non-linear distortion
UR - https://www.scopus.com/pages/publications/84893481480
M3 - Conference contribution
AN - SCOPUS:84893481480
SN - 9782874870316
T3 - European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference
SP - 684
EP - 687
BT - European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013
T2 - 2013 43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013
Y2 - 7 October 2013 through 10 October 2013
ER -