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HMC851 gain-bandwidth problem

Category: Hardware
Product Number: HMC851LC3

The last delivered HMC851LC3 (delivery code JC47) show significant differences in gain and bandwidth compared to previous deliveries (delivery code 1974). See attachment.

There are also similar differences in applications with short pulses when comparing amplitude or pulse width.

Do you have an explanation for this?

Measurement results (same circuits, same layout):

Left: HMC851LC3, previous delivery code 1974                       Right: HMC851LC3, last delivery code JC47

1. Clock Signal 10 GHz

   

2. Clock Signal 20 GHz

   

3. Clock Signal 23GHz

   

4. Clock Signal 25GHz