A ΔΣ-Digitized RF Transmitter

Jinsung Choi,Jounghyun Yim,J Yang,Jingook Kim,Jeonghyun Cha,Bumman Kim

Honolulu, HI（2007）

Cited 10|Views16

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Abstract

This paper demonstrates a new transmitter architecture digitizing an envelope to control a power amplifier. The transmitter employs a low-pass ΔΣ-modulator for constant envelope modulation and noise shaping. It enables the use of highly efficient switching amplifier with high linearity. For demonstration, the overall transmitter is implemented and tested with code-division multiple access (CDMA) IS-95A signal. The transmitter delivered the expected efficiency and linearity. The performances are maintained across the broad output power range. The results clearly show the controllability of highly efficient switching power amplifier in digital domain with simple envelope modulation technique.

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Key words

code division multiple access,delta-sigma modulation,power amplifiers,radio transmitters,δσ-digitized rf transmitter,cdma is-95a signal,code-division multiple access,constant envelope modulation,low-pass δσ-modulator,noise shaping,power amplifier,switching amplifier,radio frequency,linearity,delta sigma modulation,controllability,transmitters,low pass,power generation,testing

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