Product Summary

The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC)
contains all active circuitry in the module. The MMIC contains on-board bias circuitry,
as well as input and interstage matching circuits. The output match is realized off-chip
and within the module package to optimize efficiency and power performance into a
50 ? load. This device is manufactured with Skyworks’ GaAs Heterojunction Bipolar
Transistor (HBT) process that provides for all positive voltage DC supply operation
while maintaining high efficiency and good linearity. Primary bias to the CX77105 is
supplied directly from a three-cell nickel cadmium, a single-cell lithium ion, or other
suitable battery with an output in the 3–4 volt range. Power down is accomplished by
setting the voltage on the low current reference pin to zero volts. No external supply
side switch is needed as typical “off” leakage is a few microamperes with full primary
voltage supplied from the battery.

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