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TRF37B75: Maximum input power

Asaf Samira
Prodigy 190 points
Part Number: TRF37B75


Hi,

I’m trying to understand the maximum output power for single-tone operation at 120 MHz.

My goal is to operate the amplifier near the P1dB point (21 dBm at V = 5.25 V).

However, at 120 MHz this operating point appears to be very close to the maximum output power specified in the datasheet.

 

Is the maximum output power higher at this frequency?

 

  • 0
    TI__Expert 4580 points

    Hi Asaf Samira,

    Yes, the Output P1dB (OP1dB) at 120 MHz is indeed higher than the typical 17.5 dBm specified for 2 GHz.

    Based on Figure 5 in the datasheet:

    • At 5.0 V: The OP1dB at 120 MHz is typically around 19–20 dBm.
    • At 5.25 V: Increasing the supply voltage to the maximum recommended 5.25 V allows for a larger voltage swing, pushing the OP1dB toward 21 dBm.

    Regarding your concern about the limit, could you clarify which specific "maximum output power" specification in the datasheet you are referring to? The datasheet typically defines an Absolute Maximum Rating for Input Power (10 dBm), but not explicitly for output power.

    Operating near the P1dB point is generally safe for the device, provided you remain within the input power limits:

    • The Absolute Maximum Rating for input power is 10 dBm.

    • At 120 MHz, the typical gain is approximately 15 dB, at the P1dB compression point, the gain is compressed by 1 dB (to ~14 dB).

      Pin = Pout−Gain compressed =21 dBm−14 dB=7 dBm

      Since 7 dBm is well within the 10 dBm absolute maximum rating, this operating point is safe

    Regards,

    Hruday