Q: I’m not getting the expected gain from the HMC313 eval board above 3 GHz. Is this to be expected?
HMC313
Recommended for New Designs
The HMC313(E) is a GaAs InGaP Heterojunction Bipolar Transistor (HBT) MMIC amplifier that operates from a single Vcc supply. The surface mount SOT26 amplifier...
Datasheet
HMC313 on Analog.com
Q: I’m not getting the expected gain from the HMC313 eval board above 3 GHz. Is this to be expected?
A: The issue is caused by the design of the evaluation, specifically the location of the L1 bias induction. Ideally this inductor should touch down on the RF output trace. Instead the inductor is set back from the RF trace shown in Figure 1. This is causing significant gain roll-off above 3 GHz.
Figure 1. HMC313 Evaluation Board Layout