The ADL5390 Vector Multiplier consists of a matched pair of broadband variable gain amplifiers whose outputs are summed. The separate gain controls for each amplifier are linear-inmagnitude. If the two input signals are in quadrature, the vector multiplier can be configured as a polar vector modulator or as a variable attenuator/phase shifter by using the gain control pins as Cartesian variables . In this case, the output amplitude can be controlled from a maximum of +5 dB to less than 30 dB and the phase can be shifted continuously over the entire 360 degree range. Since the signal paths are linear, the original modulation on the inputs is preserved. If the two signals are independent, then the vector multiplier can function as a 2:1 multiplexer or provide fading from one channel to another.