TRF37B32: IF frequency Coverage

Thanks for reaching out about using the TRF37B32 with a 720 MHz IF for your application requiring 60 dBc IM3 and strong spurious performance. Here's where things stand and how we'd like to proceed:

The TRF37B32 datasheet specifies the IF output range as 30–600 MHz, defined at the amplifier's 1-dB gain corner. All of TI's published linearity (OIP3) and spurious performance data are characterized at FIF = 200 MHz. Running the IF at 720 MHz would push operation past the specified corner frequency, into a region TI does not characterize or guarantee. We'd expect some combination of gain roll-off and degraded linearity/spurious performance beyond 600 MHz, but we don't have data to say definitively whether it would still meet your 60 dBc target at 720 MHz.

What this means practically: We can't give you a confident yes/no from the datasheet alone. However, we have TRF37B32 EVMs on hand and can run empirical bench tests (two-tone IM3 and spurious scans at 720 MHz IF, benchmarked against the datasheet's 200 MHz reference condition) to get you a real answer rather than an extrapolation.

IM3 (dBc) is not a fixed number; it scales with output power (roughly 2 dB of IM3 degradation per 1 dB increase in output power, per standard third-order behavior). To make sure our bench testing is directly relevant to your application, we need: