Mimix Broadband has introduced a gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) 13/15 GHz chip set that consists of an integrated image reject receiver and transmitter and compact, two-stage power amplifier.
The image reject mixers eliminate the need for an image bandpass filter after the amplifier to remove thermal noise at the image frequency.
The device uses 0.15 micron gate length GaAs pseudomorphic high electron mobility transistor (pHEMT) technology.
The chip set uses fewer parts and has a smaller footprint and a simpler design. The devices are suitable for wireless communications applications such as millimetre-wave point-to-point radio, local multipoint distribution services, SATCOM and VSAT applications.
An image reject balanced mixer is used in the transmitter or up-converter, to minimise spurious signals and ease filtering requirements before the up-converted signal is fed to the compact single-ended PA.
Linearity is suitable for the high order QAM modulation required in new radios to maximise spectrum usage.
The useful bandwidth of the receiver and transmitter is 10 to 18 GHz, flat from 11 to 17 GHz.
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