mA vs OIP3 Transformer Feedback

mA vs OIP3 Resistor Feedback

  • Current vs. P1dB measurements
  • Black trace = P1dB approximation x 1.4 + 10
  • KN5L data
    • SSA3021X Spectrum Analyzer OIP3 measurement process
    • mA set by adjusting Vcc
    • data, 0dBm tones set at 10mA
    • data2, 0dBm tones set at 19mA
    • data3, 0dBm tones set at 14mA
    • data4, 0dBm tones set at 30mA, Maximum Vcc = 19V
    • data5, 0dBm tones set at 40mA, 2.7k||8.2k Bias R, Maximum Vcc = 19V
    • $1 = 68Ω resistor voltage
    • $2 = |3rd| dBm
  • AA7U
    • OIP3 measurement process
    • 10-20mA, Vcc = 12.0V
    • 30-70mA, Vcc = 24.0V
    • mA set by adjusting Bias Voltage
    • $1 = mA
    • $2 = OIP3 dBm



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Amplifier Schematic, ZTX327 Transistor
Additional Amplifier Info