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Three down-conversion mixers for low-voltage, balanced 900 MHz wireless applications are introduced. The mixers are implemented in a 0.8 μm BiCMOS process and based on the four transistor BJT switching quad widely used in Gilbert cells. The mixers are designed to operate at a supply voltage of 1.5 V and without external components. The implemented mixers have a few decibels of conversion loss, a third-order...
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