A 500-MHz Bandwidth 7.5-mV(pp) Ripple Power-Amplifier Supply Modulator for RF Polar Transmitters

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The parallel combination of a switching and a linear amplifier in the supply modulator for RF power amplifiers (PAs) has the potential to enhance energy efficiency while achieving wider bandwidth and lower ripple output voltage. In this paper, a linear amplifier that features a buffered-switching Class-AB bias scheme is presented for the supply modulator in polar-transmitter structures achieving 500 MHz of small-signal 3-dB bandwidth at a 1.2-V supply. The linear amplifier absorbs and cancels up to 60 mA of ripple current from the switching amplifier. As such, the ripple in the output voltage of the hybrid linear-switching supply modulator is less than 7.5 mVpp. The switching amplifier provides most of the signal current for greatest efficiency owing to a proposed rail-to-rail current-sensing circuit. Current feedback in the switching amplifier achieves 1.68-MHz unity-gain bandwidth at 6-MHz switching frequency. Harmonic distortion in the output voltage of the supply modulator is below 40 dBc at 0.8 V-pp sinusoidal input up to 9 MHz. The peak efficiency is 87.7% for a 8.25-Omega load, while the maximum output power is 23.6 dBm for a 4.99-Omega load. The chip measures 1.35 mm(2) in a 65-nm standard bulk CMOS process.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-06
Language
English
Article Type
Article
Citation

IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.53, no.6, pp.1653 - 1665

ISSN
0018-9200
DOI
10.1109/JSSC.2018.2804043
URI
http://hdl.handle.net/10203/242613
Appears in Collection
BiS-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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