New-Tech Europe Magazine | July 2016 | Digital edition

ground plane underneath the die. In this arrangement, YAT-D series dice perform superbly to 26.5 GHz. At higher frequencies, however, the attenuator performance degrades due to parasitic effects between the die and the ground plane.

Wire Wire Length (mm)

Wire Loop Height (mm)

All wires

0.25

0.15

Table 3 Recommended Wire Lengths

Table 3 Recommended Wire Lengths Wire Wire Length (mm) Wire Loop Height (mm) All wires 0.25 0.15 The die and the ground plane essentially form parallel conductive plates which create unintended capacitance expressed by the parallel plate capacitance equation (1) below.

Figure 1: Die Dimensions and Bonding Pad Positions

Figure 2: Assembly Diagram

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