AWR2243: AWR2243_20GHz FMCW Sync layout problem

Jackson chou

Prodigy 70 points

Part Number: AWR2243

Hey All:

Does the 20GHz FMCW Sync relate nets need to impendance contorl for 50ohm as ataached figure?

Thanks

Jackson

over 1 year ago

0 Jackson chou over 1 year ago

Prodigy 70 points

Hey

If 20GHz FMCW Sync trace need control to 50 ohm,

Why the AWR_1_FMCW_SYNCOUT / AWR_1_FMCW_CLKOUT on top layer don't follow the 50 ohm rule as attached file?

AWR2243_1207.pptx

Thanks

Jackson

0 aozer over 1 year ago in reply to Jackson chou

TI__Mastermind 30615 points

Hello,

The 20GHz LO is not routed as a 50 ohm single ended trace, it is routed as a GCPW with an impedance of 50 ohms. The stackup does not reflect this signal.
Typically, the design of these traces needs to be done through some field solver, not relying on the fab house to define the impedance of the trace.

Regards,

Adrian

+1 Jackson chou over 1 year ago in reply to aozer

Prodigy 70 points

Hey Adrian:

Thank your reply.

Does the AWR_1_FMCW_SYNCOUT and AWR_1_FMCW_CLKOUT are stripline or CPW trace in Layer 3 form TI referrence design PCB board ?

Thanks

Jacskon

0 aozer over 1 year ago in reply to Jackson chou

TI__Mastermind 30615 points

Hello,

The inner layers are routed as a coplanar waveguide with GND.

Regards,

Adrian

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AWR2243: AWR2243_20GHz FMCW Sync layout problem