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ΔΣ digitised polar transmitter with CMOS switching power amplifier

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4 Author(s)
Paek, J.-S. ; Sch. of Eng., Korea Advenced Institude of Sci. & Technol., Daejeon, South Korea ; Lee, H.-Y. ; Joo, T.H. ; Hong, S.

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.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 23 )