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M20047-1 support components
I have designed your M20047-1 into a new product. For initial production I would like your comments on the choice of support components.
Referring to the schematic in Page 1 of

I use:
D1 = Semtech RCLAMP3331ZATFT
L1 = 47nH Delta 0402HM-470EKTS
C1 = 56pF Vishay VJ0402D560JXAAJ, due to re-use in other parts of the board

The other side of L1 is decoupled with 2x 56pF Vishay VJ0402D560JXAAJ

Which initial values should I use for R1 and L2?
I have access to a vector network analyzer. The antenna track can be intercepted for analysis of the antenna only, without the radio chip in the loop. Do you have a procedure for tuning of the active GPS antenna on the circuit board?

Best regards,
Børge Strand-Bergesen

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1 Answer

answered by

Hi Børge,

D1, L1 and C1 are fine. 

Initially you should start with 0ohm for both R1 and L2 when tuning. 

We can assist you with the matching as we offer a tuning service in our lab as well as design review. I've passed your details on to your regional representative who will be in touch soon so we can give you a full response tailored to your specific requirements.

Many Thanks


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