Category: RF Pallet Design

  • Nulling the Even Harmonics

    Nulling the Even Harmonics

    There’s a quite famous audio amplifier builder (legendary really) named Nelson Pass that makes very high end audio amplifiers. In some of his amps, he even goes so far as to allow you to manually skew the bias via a knob on the front, so you can slant the harmonic content towards even or odd…

  • New 2x LDMOS Bias Supply Front End PCB

    New 2x LDMOS Bias Supply Front End PCB

      Designed this new little front end PCB this weekend. My primary goals were as follows: Provide a regulated bias supply using a precision regulator to provide more accurate regulation and some ripple rejection, unlike a straight zener. Allow for independent adjustment of each LDMOS bias, with absolutely no interaction, i.e., adjustment to one side…

  • Redesigning the Dual 188XR Test Pallet

    Redesigning the Dual 188XR Test Pallet

    Here I will attempt to chronicle the tear down and rebuild of my primary test pallet, which is a dual BLF188XR pallet. This was one of my early designs and I have since done many more and this one needs updating. Plus I want to try some more new things on this pallet. I usually…