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 QAM               quadrature (quaternary) amplitude modulation

QFN                quad flat no-lead (package)

QIFM              quadrature intermediate frequency mixer

QoS                 quality of service

QPSK              quadrature phase shift keying

QRNS             quadratic residue number system

QSOP              quality small outline package

QWIP              quantum well infrared photodetector

 QWR               quarter wave rule