Designing Efficient Digital Up and Down Converters for Narrowband Systems Application Note: Virtex-5 FPGAs Creating a Controllable Oscillator Using the Virtex-5 FPGA IODELAY Primitive Author: Martin Kellermann XAPP872 (v1.0) April 28, 2009 Introduction. This application note describes how to use the Virtex-5 FPGA input/output delay (IODELAY) primitive as a means to create a high-precision adjustable oscillator with a wide tuning range. ……