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A monolithic low‐cost 1 mm 2 balanced BPSK modulator employing cold HBTs and scaled‐down couplers at 38 GHz
Author(s) -
Ashtiani A. E.,
Robertson I. D.
Publication year - 2000
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(20000220)24:4<215::aid-mop2>3.0.co;2-u
Subject(s) - monolithic microwave integrated circuit , microwave , modulation (music) , materials science , extremely high frequency , optoelectronics , amplitude , microstrip , amplitude modulation , engineering , electrical engineering , electronic engineering , topology (electrical circuits) , frequency modulation , physics , telecommunications , radio frequency , optics , cmos , amplifier , acoustics
The design and performance of a 38 GHz MMIC biphase amplitude modulator employing cold HBTs as switching elements are presented. Direct carrier modulation together with a balancing topology are employed to lower the circuit's complexity and cost, and to remove the amplitude and phase errors that occur at higher frequencies. Furthermore, by using a miniature microstrip coupler, the total area of the chip is reduced to 1 mm 2 . It is found that this technique is very robust, producing excellent performances at millimeter‐wave frequencies. ©2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 215–218, 2000.