topic Re: MMZ09332BT1 in Wireless MCU

MMZ09332BT1

bsky2345 — Mon, 25 Sep 2023 12:06:01 GMT

I want to use the MMZ09332BT1 in the frequency range 760-870 MHz, but with FR4 instead of RO4350B. I will change the trace width in the RF out and RF lines to achieve an impedance of 50 ohms. Should I consider anything else, such as the length of the VCC line?If the component was perfectly internally matched, I would make this change (using FR4) with confidence. However, the MMZ09332BT1 data sheet says that it "requires minimal external matching."

Re: MMZ09332BT1

ErikaC — Mon, 25 Sep 2023 21:33:25 GMT

Hello,

Substrate dielectric permittivity and thickness is critical. The width input/output traces is set to provide 50 Ohm impedance.

Datasheet specifies substrate RO4350B, Dk=3.66, the thickness is 10mil top dielectric layer. Three dielectric layers with total thickness of 32 mils.

Typical FR-4 has Dk=4.8. You can use the same layout as in the datasheet but the top dielectric layer thickness should be 12.3 mils (small variations possible, 12mils).

Hope this helps.

Re: MMZ09332BT1

bsky2345 — Tue, 03 Oct 2023 13:58:02 GMT

Hello

This tips help me and I redesign my pcb and sent for production.

Thanks