TY - JOUR
T1 - An Intrinsically Linear Wideband Polar Digital Power Amplifier
AU - Hashemi, Mohsen
AU - Shen, Yiyu
AU - Mehrpoo, Mohammadreza
AU - Alavi, Morteza S.
AU - de Vreede, Leo
PY - 2017
Y1 - 2017
N2 - This paper presents an intrinsically linear wideband polar digital power
amplifier (DPA) operating in semi class-E/F2 mode. Without using any
type of digital pre-distortion (DPD), the proposed architecture achieves
high linearity by accurately controlling its AM-AM and AM-PM
characteristic curves through nonlinear sizing, overdrive-voltage
control, and multiphase RF clocking without compromising the achievable
output power or efficiency. Measurement results of the fabricated
prototype in 40-nm bulk CMOS show -46 and -40 dBc adjacent channel power
ratio (ACPR) for 20and 40-MHz orthogonal frequency-division
multiplexing (OFDM) signals, respectively. The measured error vector
magnitudes (EVM) are -36 dB and -33 dB, respectively. Measured results
indicate a PSAT, peak drain efficiency (DE), and power-added efficiency
(PAE) of 14.6 dBm, 44%, and 26%, respectively, using a 0.5-V supply for
the output stage at 2.2 GHz.
AB - This paper presents an intrinsically linear wideband polar digital power
amplifier (DPA) operating in semi class-E/F2 mode. Without using any
type of digital pre-distortion (DPD), the proposed architecture achieves
high linearity by accurately controlling its AM-AM and AM-PM
characteristic curves through nonlinear sizing, overdrive-voltage
control, and multiphase RF clocking without compromising the achievable
output power or efficiency. Measurement results of the fabricated
prototype in 40-nm bulk CMOS show -46 and -40 dBc adjacent channel power
ratio (ACPR) for 20and 40-MHz orthogonal frequency-division
multiplexing (OFDM) signals, respectively. The measured error vector
magnitudes (EVM) are -36 dB and -33 dB, respectively. Measured results
indicate a PSAT, peak drain efficiency (DE), and power-added efficiency
(PAE) of 14.6 dBm, 44%, and 26%, respectively, using a 0.5-V supply for
the output stage at 2.2 GHz.
KW - Class-E/F2
KW - digital power amplifier (DPA)
KW - digital pre-distortion (DPD)-less
KW - efficient
KW - linear
KW - multiphase RF clocking
KW - nonlinear sizing
KW - overdrive-voltage control
KW - wideband
U2 - 10.1109/JSSC.2017.2737647
DO - 10.1109/JSSC.2017.2737647
M3 - Article
SN - 0018-9200
VL - 52
SP - 3312
EP - 3328
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 12
ER -