Category: LDMOS Testing and Performance
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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…
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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…
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TLT Design and Testing
Cold Rainy Saturday here today so I decided to experiment with some TLT designs and ideas. Stripped the TLTs off my old standby pallet, a 2 x BLF188 and went to work. You can design TLTs using the math, but trust me, this only gets you in the ballpark – a starting point if you…
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Testing a 2x MRFX1K80H LDMOS Amp
The other day, a fellow amp building buddy asked me what I was seeing for performance on my double MRFX1K80H LDMOS Amp. I pulled out the ole dummy load and set up this quick test bench. On the left you can see the home made ~4kW dummy load. Amp in the middle and LP-100A…