Hi team,
a customer of mine is interested in the frequency response performance of the THS3491RGT. When testing the EVM the measured frequency response does not align with the specs from the datasheet. Here is the setup:
- Agilent E5061A Networkanalyzer
- 2x 1m long RG58 cables with an N and SMA connector each.
- Meaurement is calibrated regarding S11 and S2 -> cables should not affect the measurement
- +-15V power supply to EVM
- Input level is -20dBm to measure small signal response
Attached you find the values of S11 and S21 from 300kHz to 1.5GHz. You can see that at 300 kHz the value of S21 aligns with the specs from the datasheet but decreases strongly at higher frequencies.
Also the datasheet only mentions typical values for the frequency response. Are there any upper/lower limits that are guaranteed to be met? The customer would like to use the part up to 450MHz.
Thank you for your help!
BR,
Stefan