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3-chip transceiver solution

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article image Mimix’s 3-chip solution.

MIMIX Broadband Inc., represented in Australia by Richardson Electronics Pty Ltd , has introduced a gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) 13/15GHz chip set that consists of a highly 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 chipset uses 0.15μ gate length GaAs pseudomorphic high electron mobility transistor (pHEMT) device model technology.

This 3-chip solution lowers costs and variability of transceivers by using fewer parts, a smaller footprint area and a simpler design.

These devices are suitable for wireless communications applications such as millimeter-wave point-to-point radio, local multipoint distribution services (LMDS), SATCOM and VSAT applications.

“The receiver uses an image reject resistive ‘cold fet’ fundamental mixer to provide wide bandwidth and excellent intermodulation performance,” said CTO of Mimix Broadband, Jim Harvey.

“An image reject balanced mixer is used in the transmitter, or up-converter, to minimise spurious 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 10GHz to 18GHz, flat from 11GHz to 17GHz, so they cover the commercial 13GHz and 15GHz bands and intermediate satellite bands,” sasid Dr Harvey.

Mimix performs 100% on-wafer RF and dc testing on these products, as well as 100% visual inspection to MIL-STD-883 method 2010.

The chips also have surface passivation to protect and provide rugged parts with backside via holes and gold metallisation to allow either a conductive epoxy or eutectic solder die attach process.

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