A stable 250 to 4000 MHz GaAs IQ modulator IC

An in-phase/quadrature (IQ) vector modulator provides the capability to simultaneously modulate the magnitude and phase of a carrier. This versatile modulation capability is widely used in communications systems to generate signals of minimal spectral width. An accurate and broadband IQ modulator is a valuable part of a general-purpose test-signal generator. This 250 to 4000MHz GaAs FET IQ modulator IC uses an RC and a CR network to create quadrature signals.