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quartiq / booster

Firmware for the Sinara Booster RF amplifier
Apache License 2.0
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improve bias tuning algorithm #123

Open hartytp opened 3 years ago

hartytp commented 3 years ago

I've noticed that tuning the bias current often fails. It looks like the algorithm is converging, but gives up too soon. Running the tuning process again seems to resolve this...

Vgs = -2.100 V, Ids = 1.36 mA
Vgs = -2.079 V, Ids = 1.36 mA
Vgs = -2.059 V, Ids = 1.36 mA
Vgs = -2.040 V, Ids = 1.36 mA
Vgs = -2.020 V, Ids = 1.36 mA
Vgs = -2.000 V, Ids = 1.36 mA
Vgs = -1.980 V, Ids = 1.36 mA
Vgs = -1.959 V, Ids = 1.36 mA
Vgs = -1.939 V, Ids = 1.36 mA
Vgs = -1.920 V, Ids = 1.36 mA
Vgs = -1.900 V, Ids = 1.36 mA
Vgs = -1.880 V, Ids = 1.36 mA
Vgs = -1.859 V, Ids = 1.36 mA
Vgs = -1.839 V, Ids = 1.36 mA
Vgs = -1.820 V, Ids = 1.36 mA
Vgs = -1.800 V, Ids = 1.36 mA
Vgs = -1.780 V, Ids = 1.56 mA
Vgs = -1.760 V, Ids = 1.75 mA
Vgs = -1.739 V, Ids = 1.95 mA
Vgs = -1.719 V, Ids = 2.34 mA
Vgs = -1.700 V, Ids = 2.92 mA
Vgs = -1.680 V, Ids = 3.70 mA
Vgs = -1.660 V, Ids = 4.68 mA
Vgs = -1.640 V, Ids = 6.24 mA
Vgs = -1.619 V, Ids = 8.77 mA
Vgs = -1.599 V, Ids = 11.11 mA
Vgs = -1.580 V, Ids = 14.04 mA
Vgs = -1.560 V, Ids = 17.35 mA
Vgs = -1.540 V, Ids = 21.25 mA
Vgs = -1.519 V, Ids = 26.13 mA
Vgs = -1.499 V, Ids = 31.00 mA
Vgs = -1.479 V, Ids = 37.24 mA
Vgs = -1.460 V, Ids = 43.09 mA
Vgs = -1.440 V, Ids = 49.52 mA
Vgs = -1.420 V, Ids = 56.74 mA
Vgs = -1.420 V, Ids = 57.91 mA
Vgs = -1.422 V, Ids = 58.69 mA
Vgs = -1.423 V, Ids = 59.27 mA
Vgs = -1.424 V, Ids = 59.47 mA
Vgs = -1.424 V, Ids = 61.03 mA
Vgs = -1.425 V, Ids = 60.83 mA
Vgs = -1.427 V, Ids = 60.64 mA
Vgs = -1.428 V, Ids = 60.44 mA
Vgs = -1.428 V, Ids = 60.44 mA
Vgs = -1.429 V, Ids = 60.25 mA
Vgs = -1.431 V, Ids = 59.86 mA
Vgs = -1.432 V, Ids = 59.66 mA
Vgs = -1.432 V, Ids = 59.47 mA
Vgs = -1.433 V, Ids = 59.27 mA
Vgs = -1.435 V, Ids = 59.08 mA
Vgs = -1.436 V, Ids = 58.69 mA
Vgs = -1.436 V, Ids = 58.69 mA
Vgs = -1.437 V, Ids = 58.30 mA
Vgs = -1.439 V, Ids = 58.10 mA
Vgs = -1.440 V, Ids = 57.91 mA
Vgs = -1.441 V, Ids = 57.52 mA
Vgs = -1.441 V, Ids = 57.52 mA
Vgs = -1.443 V, Ids = 57.13 mA
Vgs = -1.444 V, Ids = 56.93 mA
Vgs = -1.445 V, Ids = 56.74 mA
Vgs = -1.445 V, Ids = 56.35 mA
Vgs = -1.447 V, Ids = 55.96 mA
Vgs = -1.448 V, Ids = 55.76 mA
Vgs = -1.449 V, Ids = 55.57 mA
Vgs = -1.449 V, Ids = 55.37 mA
jordens commented 3 years ago

Needs somebody with deep understanding of the hardware design to analyze, improve, test, debug, characterize, document, maintain etc an improved algorithm.