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# TRF370417: Datasheet figure1(Output Power vs Baseband Voltage) understanding

Part Number: TRF370417

Hello team,

Regarding TRF370417 datasheet figure1(Output Power vs Baseband Voltage), Could you let me know if below my understanding correct?

A case of BBIP-BBIN and BBQP-BBQN are moving on circle with radius of 0.1V with 50kHz(below graph) means VBB=0.1V. And in this case, output power is about -3dBm, according to figure 1.

Best regards,

• Hi Sato-san,

You have the concept correct. The datasheet figure 1 is specifying RMS input voltage level, not peak. The circle that you are drawing is referenced to the peak I or Q voltage. In theory, there are sine/cosine waves in the Z axis serves as time, and the RMS level of the sine/cosine wave is the x -axis of the Figure 1.

• Hello Kang-san,

According to Figure1, output power is about -3dBm in case of VBB is 0.1V.

What Vpp as BBIP will represent the VBB=0.1V?

Best regards,

• Hello Sato-san,

As the input source is a sine wave, you can follow the standard Vrms to Vpp conversion.

Example calculator:

-Kang

• Hello Kang-san,

0.141Vpp sine wave input of BBIP and BBIN(and BBQP and BBQN) means 0.1V condition of figure1 and then output power will be about -3dBm, correct?

In case BBIP and BBIN is 0.141Vpp sine wave, BBIP-BBIN will be 0.283Vpp signal and it is 0.1Vrms

Best regards,

• Sato-san,

You need to do the math more carefully.

0.1Vrms = 0.281Vpp. Please go through the training again.

We are only talking about BBI = 0.2881Vpp and BBQ = 0.2881Vpp.

There is no need to consider BBI - BBQ.