Hi,
Good Day.
For an astronomy project at our university, we are looking for a suitable amplifier to connect to our antenna. In our search, we came across the THS4511 made by Texas Instruments and as it seemed a promising candidate, I read through the datasheet.
There I noticed the remark on page 18 that 12 dB (x16 in linear) should be added to refer the S21 measurement to a differential signal output. From theory, I know that single-ended gain is half of the differential gain which accounts for a factor of 2 (once due to the single-ended input and once due to the single-ended output). Another factor of 2 could originate from the 50 Ohm termination. However, combining these to 2x2x2=8 results in still missing another factor of 2 to arrive at the x16 or 12 dB mentioned in the datasheet. Could you please explain why one should add 12 dB?
Please advise. Thank you very much.
Best Regards,
Ray Vincent
