Application Notes

The TRF3722 is a high performance modulator with integrated PLL/VCO for supplying the local oscillator (LO) source. There is a known coupling mechanism within the device that degrades zero-IF (ZIF) linearity when the LO frequency is in the fundamental range of the VCO. Operating at a low IF input solves the issue but in cases where a low IF offset is not possible another option is to use the 3nd