A broadband SiGe power amplifier in an efficient polar transmitter using envelope-tracking for mobile WiMAX

Yan Li, Jerry Lopez, Donald Y.C. Lie, Kevin Chen, Stanley Wu, Tzu Yin Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

This paper presents a broadband cascode SiGe power amplifier (PA) in the polar transmitter (TX) system using the envelope-tacking (ET) technique. The cascode PA achieves the power-added efficiency (PAE) of >30% across the frequency range of 0.6-2.4 GHz in continuous wave (CW) mode. The ET-based polar TX system using this cascode PA is evaluated and compared with the conventional stand-alone cascode PA. The experimental data shows that the cascode PA is successfully linearized by the ET scheme, passing the stringent WiMAX spectral mask and the required error vector magnitude (EVM). The entire polar TX system reaches the PAE of 30%/36% at the average output power of 18/17 dBm at 2.3/0.7 GHz for WiMAX 16QAM 3.5 MHz signals. These measurement results suggest that our saturated cascode SiGe PA can be attractive for dual-mode WiMAX applications.

Original languageEnglish
Title of host publication2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF 2011 - Digest of Papers
Pages137-140
Number of pages4
DOIs
StatePublished - 2011
Event2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF 2011 - Phoenix, AR, United States
Duration: Jan 16 2011Jan 19 2011

Publication series

Name2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF 2011 - Digest of Papers

Conference

Conference2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF 2011
CountryUnited States
CityPhoenix, AR
Period01/16/1101/19/11

Keywords

  • Cascode power amplifier (PA)
  • Envelope amplifier
  • Envelope-tracking (ET)
  • PA linearization
  • Polar transmitter
  • Power-added efficiency (PAE)

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