Title :
110 GHz vector modulator for adaptive software-controlled transmitters
Author :
McPherson, Douglas S. ; Seo, Hwa-chang ; Jing, Young-lae ; Lucyszyn, Stepan
Author_Institution :
Dept. of Electron. Eng., Surrey Univ., Guildford, UK
Abstract :
A 110 GHz MMIC vector modulator for use in low-cost, high-performance, radar and communication transmitters is presented. The circuit consists of two push-pull (bi-phase) attenuators arranged in phase quadrature and has dimensions of 1.7times 1.4 mm2. The fabricated MMIC has been characterized by means of static S-parameter measurements and shows a minimum insertion loss of 12 dB at 110 GHz, Using these measurements, the required baseband input levels for a 64-QAM static constellation were determined. These levels were then applied at 10 MSample/s, by an arbitrary waveform generator, to demonstrate a 60 Mb/s data rate transmitter operating at 110 GHz. To date, this represents the highest reported RF frequency for direct multilevel carrier modulation using monolithic technology.
Keywords :
HEMT integrated circuits; adaptive systems; field effect MIMIC; integrated circuit design; modulators; quadrature amplitude modulation; radar transmitters; radio transmitters; 110 GHz; 12 dB; 60 Mbit/s; 64-QAM static constellation; D-band; EHF; MIMIC vector modulator; MM-wave IC; PHEMT IC; W-band; adaptive software-controlled transmitters; bi-phase attenuators; communication transmitters; direct multilevel carrier modulation; monolithic technology; phase quadrature; pseudomorphic HEMT; push-pull attenuators; radar transmitters; static S-parameter measurements; Attenuators; Baseband; Circuits; Insertion loss; Loss measurement; MMICs; Radar; Scattering parameters; Signal generators; Transmitters;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/7260.905954
