MOSFET in UCODE 7 chip

[Wenli]

Hello, I want to know the I-V characteristics of the MOSFET used inside the NXP UCODE 7 chip, the MOSFET switch used for backscattering in the data-out chain. Can someone provide this data? Thanks a lot~

[KaiLi]

Hello @Wenli 

Thanks for contacting us and interested in the NXP products.
The tags send back data by switching the reflection coefficient of its antenna between high and low states. The backscatter modulation by the tag will use a fixed modulation format and can be either ASK or PSK. PSK or Phase Shift Keying can be used in place of ASK in the Reverse Link.    Phase Shift Keying represents 0 or a 1 by changes in the phase of the carrier frequency.
Therefore, based on the above description, the logic 0 and 1 that control the MOSFET switch should not be a simple current-voltage correspondence. This should be related to the energy of the electromagnetic field and signal demodulation techniques. It's recommended that you refer to the specification of backscatter demodulation technology.
​​​​​​​

To update this case, you may reply by email.
To provide confidential information or attachments, you may add that online.

Please login to our NXP technical support portal:
https://support.nxp.com/s/case/5002p00002s4HnBAAU

The portal allows access to the full details of the case, including the previous communication.

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.

Best regards,
Kelly
Technical Support
NXP Semiconductor

[Wenli]

Dear Kelly,

Thanks for your reply. I want to get the I-V characteristic curve of this MOSFET (i.e., the relationship between Vgs/Vds and Id), since I focus on the minimum working voltage of this MOSFET.

Thank you a lot!

Best regards,

Wenli

[KaiLi]

Hello @Wenli 

Yes, I know you're looking for an I-V relationship, and there's usually a graph of that relationship for a single MOSFET.  But for products like UCODE 7 backscatters by switching the reflection coefficient of its antenna between two states in accordance with the data being sent.  The logic 1 and 0 of the internal MOD switch comes from the strength of the signal.  The default state maximum backscatter is enabled.
Therefore, UCOD presents RF characteristics externally, but does not present the electrical characteristics of the module inside the chip.  Therefore, it is more appropriate for your design to focus on the strength of the signal, please understand the inconvenience.

To update this case, you may reply by email.
To provide confidential information or attachments, you may add that online.

Please login to our NXP technical support portal:
https://support.nxp.com/s/case/5002p00002s4HnBAAU

The portal allows access to the full details of the case, including the previous communication.

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.

Best regards,
Kelly
Technical Support
NXP Semiconductor