6 Conclusion

You do not have to be an expert simulator when developing a narrowband matching application to your particular high-speed RF sampling ADC. This NB matching approach can be used to help strengthen any upstream filtering in the RF signal chain. First, address the resistive part of the NB matching effort by using the chosen balun’s return loss values from its datasheet to will help improve the input front-end network’s return loss. Next, use the ADC’s given S-parameters, datasheet input model or lumped element R||C values in the specification tables as a starting point to your NB match, at your frequency band of interest. Keep in mind, the balun and pcb layout contribute to the passive components needed to complete the match. Make sure these are factored in as well as a starting point.

With a little simulation to provide direction and some simple math, you can accelerate your next high-speed RF converter design in no time.