A wide-band linear amplitude modulator for polar transmitters based on the concept of interleaving delta modulation

Author

Nagle, Pierce ; Burton, Phil ; Heaney, Eugene ; McGrath, Finbarr

Author_Institution

M/A-COM Eurotec, Cork, Ireland

Volume

37

Issue

12

fYear

2002

fDate

12/1/2002 12:00:00 AM

Firstpage

1748

Lastpage

1756

Abstract

Polar transmission techniques offer the capability of multimode wireless transmission and the potential for significant efficiency gains over solutions based on I/Q. However, polar transmitters are difficult to implement because of the wide bandwidths associated with the phase and envelope signals. Moreover, accurate synchronization between envelope and phase components is essential in minimizing distortion. A concept named Interleaving Delta Modulation (iDM) is proposed to overcome some of the issues associated with polar transmission. IDM minimizes distortion and improves efficiency by replacing a stream of fast drive pulses to the amplitude modulator with a parallel stream of slower pulses. Circuitry to implement iDM has been designed, fabricated, and measured in 0.35-μm CMOS technology.

Keywords

CMOS integrated circuits; amplitude modulation; delta modulation; distortion; mixed analogue-digital integrated circuits; modulators; radio transmitters; synchronisation; 0.35 micron; CMOS technology; distortion minimization; envelope signals; interleaving delta modulation; multimode wireless transmission; phase signals; polar transmission techniques; polar transmitters; synchronization; wideband linear amplitude modulator; Amplitude modulation; Bandwidth; CMOS technology; Delta modulation; Drives; Interleaved codes; Phase distortion; Pulse modulation; Transmitters; Wideband;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2002.804351

Filename

1088104