A Digitally Modulated Polar CMOS Power Amplifier With a 20-MHz Channel Bandwidth
Top Cited Papers
- 7 October 2008
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 43 (10), 2251-2258
- https://doi.org/10.1109/jssc.2008.2004338
Abstract
This paper presents a CMOS RF power amplifier that employs a digital polar architecture to improve the overall power efficiency when amplifying signals with high linearity requirements. The power amplifier comprises 64 parallel RF amplifiers that are driven by a constant envelope RF phase-modulated signal. The unit amplifiers are digitally activated by a 6-bit envelope code to construct a non-constant envelope RF output, thereby performing a digital-to-RF conversion. In order to suppress the spectral images resulting from the discrete-time to continuous-time conversion of the envelope, the use of oversampling and four-fold linear interpolation is explored. An experimental prototype of the polar amplifier has been integrated in a 0.18- mum CMOS technology, occupies a total die area of 1.8 mm2 , operates at a 1.6-GHz carrier frequency with a channel bandwidth of 20 MHz. For an OFDM signal, it achieves a power-added efficiency of 6.7% with an EVM of - 26.8 dB while delivering 13.6 dBm of linear output power and drawing 145 mA from a 1.7-V supply.Keywords
This publication has 19 references indexed in Scilit:
- A Monolithic High-Efficiency 2.4-GHz 20-dBm SiGe BiCMOS Envelope-Tracking OFDM Power AmplifierIEEE Journal of Solid-State Circuits, 2007
- A Digitally Modulated Polar CMOS PA with 20MHz Signal BWIEEE International Solid-State Circuits Conference, 2007
- A $+$31.5 dBm CMOS RF Doherty Power Amplifier for Wireless CommunicationsIEEE Journal of Solid-State Circuits, 2006
- A polar modulator transmitter for GSM/EDGEIEEE Journal of Solid-State Circuits, 2004
- An envelope elimination and restoration power amplifier using a CMOS dynamic power supply circuitPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- Radio frequency digital-to-analog converterIEEE Journal of Solid-State Circuits, 2004
- A 10-bit wide-band cmos direct digital rf amplitude modulatorIEEE Journal of Solid-State Circuits, 2003
- A CMOS RF power amplifier with parallel amplification for efficient power controlIEEE Journal of Solid-State Circuits, 2002
- A 10-b, 500-MSample/s CMOS DAC in 0.6 mm/sup 2/IEEE Journal of Solid-State Circuits, 1998
- Single-Sideband Transmission by Envelope Elimination and RestorationProceedings of the IRE, 1952