1 / 14

Comparing CalRdy, QuickCal and 2-port cal on N9923A A filter test Prepared by: Afsi Moaveni

Comparing CalRdy, QuickCal and 2-port cal on N9923A A filter test Prepared by: Afsi Moaveni Last update: May 12, 2010. Filter Measurement on N9923A . (3) QuickCal or 2-port cal reference plane is at DUT. (1) Note black cable connecting test port to filter.

odell
Download Presentation

Comparing CalRdy, QuickCal and 2-port cal on N9923A A filter test Prepared by: Afsi Moaveni

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Comparing CalRdy, QuickCal and 2-port cal on N9923A A filter test Prepared by: Afsi Moaveni Last update: May 12, 2010

  2. Filter Measurement on N9923A (3) QuickCal or 2-port cal reference plane is at DUT. (1) Note black cable connecting test port to filter. (2) CalRdy reference plane is at test port. N9923A QuickCal performed with a load.

  3. Filter Measurements – Full 2-port cal

  4. S21 magnitude - entire trace. zoomed out S21 of bandpass filter

  5. S21 magnitude – passband. zoomed in. • With CalRdy, slightly more loss in the passband of the filter because the black cable that connects the filter to the test ports is not accounted for with CalRdy. • 2-port cal and QuickCal nearly identical.

  6. S21 phase – entire trace. zoomed out. Rejection band of filter – noisy measurements (90-100 dB loss S21) measurement s

  7. S21 phase – passband. zoomed in. • CalRdy is offset from 2-port cal and QuickCal because we have not compensated for the extra delay in the cable. • 2-port cal and QuickCal nearly identical.

  8. S11 magnitude – entire trace. zoomed out. • Return loss in passband better than 15 dB.

  9. S11 phase – entire trace. zoomed out. • Much variation observed. Can be explained if you zoom in. See next slide.

  10. S11 magnitude – passband. zoomed in. • CalRdy is a bit different. Test port cable effects not corrected for. • QuickCal and 2-port cal similar.

  11. S11 phase – passband. zoomed in. • Phase with CalRdy is off, because of length of cable. • Phase difference between 2-port cal and QuickCal observed because S11 magnitude is very good. Return loss in the 20-40 dB range. • Next slide shows reject band.

  12. S11 phase – reject band. zoomed in. • Phase with CalRdy is off because of length of cable. • 2-port cal and QuickCal nearly identical.

  13. Approximate measurement uncertainties

  14. Summary of results • CalRdy good for magnitude – if cable/attenuators have low loss or if it is a pass/fail test with wide margins. • QuickCal very good for magnitude. QuickCal good for phase if return loss of device is between 0 and 15 dB approximately. • 2-port cal always the most accurate.

More Related