Title :
ΔΣ digitised polar transmitter with CMOS switching power amplifier
Author :
Paek, J.-S. ; Lee, H.-Y. ; Joo, T.H. ; Hong, Seong-Kwan
Author_Institution :
Sch. of Eng., Korea Advenced Institude of Sci. & Technol., Daejeon, South Korea
Abstract :
A delta-sigma (ΔΣ) digitised polar RF transmitter with a CMOS switching power amplifier is presented. The proposed power amplifier consists of a class-E amplifier with a modulating current source which allows high efficiency and high linearity. A current source is introduced in the proposed power amplifier to achieve ΔΣ digitised amplitude modulation. The current mode amplitude modulation is suitable for a high speed modulated signal such as an oversampled ΔΣ signal.
Keywords :
CMOS integrated circuits; amplitude modulation; delta-sigma modulation; power amplifiers; radio transmitters; CMOS switching power amplifier; class-E amplifier; current mode amplitude modulation; delta-sigma digitised polar RF transmitter; digitised amplitude modulation; high speed modulated signal; modulating current source; oversampled signal;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2699
