Up Converter

40.5 - 43.5 GHz

Rev. V5

MAUC-010515

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part should be the same. Depending on the supply voltages available and the power dissipation constraints, the

bias circuits may include a single transistor or a low power operational amplifier, with a low value resistor in series

with the drain supply to sense the current. Make sure to sequence the applied voltage to ensure negative gate

bias is available before applying the positive drain supply.

App Note [2] I/Q versus I*/Q* - The IF input to the typical configuration is through a 90° hybrid coupler. The

hybrid splits the IF input into inphase and quadrature phase components. These two signals enter the

MAUC-010515 on either the I/Q pair, or the I*/Q* complimentary pair. Whichever pair are not used must be

terminated into 50 Ω. There are subtle differences between the performance when using the main IF ports (I, Q)

versus the complimentary ports (I*, Q*). For highest gain, best image rejection and lowest noise figure, the main

IF ports (I, Q) should be used.