NimbleSig III, version 1.4 Analog/Digital Ground Bus Bonding at the DDS Chip Modification

    This easy to install modification shown in photos below can be implemented with the following two steps:

1) Replace the R21, 0 Ohm resistor with an 0603 RF Bead of the same type as used for RFB1-3 (see figs 1 and 3).

2) Using a short length of solder wick braid connect the grounded end of C28 to the grounded end of C34 (see figs 1 and 2).





Figure 1: Overview of component locations.




Figure 2: Closeup view of the solder braid bridge between grounded sides of C28 and C34.




Figure 3: Closeup view of  the RF bead used to replace the R21, 0 Ohm resistor.