Difference between pages "File:RF-AMP-LTSPICE XFMRS.PNG" and "RF-Amp"

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[[File:RF-Amp_Front.png]]
  
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== RF Amplifier Features ==
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* From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig]
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** Solid State Design for the Radio Amateur?
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* +22 dB gain
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* Input connectors: SMA or BNC
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* 49x49mm card
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* 4x 4-40 mounting holes
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== RF Amplifier Design ==
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=== Schematic ===
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[[file:RF_Amp_Schematic-4.PNG]]
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=== DC Operating Point ===
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* Ice = 10 mA
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* Ve = 0.1 * Vcc = 1.2V
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=== Input/Output Transformer ===
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==== FT37-43 Toroid ====
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* [http://toroids.info/FT37-43.php FT37-43]
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* Wideband Transformers 5 - 400 MHz
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* Power Transformers 0.5 - 30 MHz
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* 10 turns = 35uH
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[[file:FT37-43_10_Turns.PNG]]
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==== Tracks ====
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[[file:RF-Amp-tracks.PNG]]
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==== Input Transformer ====
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** Input Transformer (T1 on Charlie's - T2 on this board)
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***  50:75.8 Ohms = 1 : 1.23 turns ratio
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**** 9 turns primary, 11 turns on secondary
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[[file:RF-Amp-T2.PNG]]
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==== Output Transformer ====
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** Output transformer (T2 on Charlie's - T1 on this board)
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*** 200:50 Ohms = 2:1 turns ratio
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*** 10 turns primary (on transistor collector), 5 turns secondary (towards output)
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[[file:RF-Amp-T1.PNG]]
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== LT Spice Simulation ==
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=== Transformers ===
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[[File:RF-AMP-LTSPICE_XFMRS.PNG]]
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== Charlie Morris Schematics ==
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* From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig]
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=== IF AMP ===
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* From Charlie's notes
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** DC Operating Point = 10 mA
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** V(emitter resistor) = 1/10 Vcc = 1.2V
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*** R(emitter resistor) = 1.2V/0.01A = 120 ohms
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* Beta DC = geometric mean min/max beta at operating current
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** = sqrt(100*300) = 173
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* Beta AC = gain bandwidth product divided by operating frequency
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** Assume operating frequency of 10 MHz (my IF is actually at 9 MHz)
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** = 300/10 = 30
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* VCE = 0.7V
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* V(emitter) = 1.2V
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* V(base) = V(emitter) + VCE = 1.9V
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* Assume current in biasing resistors = 10x current needed by DC beta
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** 10 mA in C-E, beta DC less = 10 mA/173 \
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[[FILE:IF Amp_0046A.jpg]]
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[[FILE:IF Amp_0046B.jpg]]
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[[FILE:IF Amp_0046C.jpg]]
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[[FILE:IF Amp_0047A.jpg]]
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[[FILE:IF Amp_0047B.jpg]]
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[[FILE:IF Amp_0047C.jpg]]
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== Video ==
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<video type="youtube">CHdtoupH2Vg</video>
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<video type="youtube">YJTsWV2kzFY</video>
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<video type="youtube">xPFzFhM0ojE</video>
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== Assembly Sheet ==
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* [[RF Amplifier Assembly Sheet]]

Revision as of 10:01, 6 November 2021

RF-Amp Front.png

RF Amplifier Features

RF Amplifier Design

Schematic

RF Amp Schematic-4.PNG

DC Operating Point

  • Ice = 10 mA
  • Ve = 0.1 * Vcc = 1.2V

Input/Output Transformer

FT37-43 Toroid

  • FT37-43
  • Wideband Transformers 5 - 400 MHz
  • Power Transformers 0.5 - 30 MHz
  • 10 turns = 35uH

FT37-43 10 Turns.PNG

Tracks

RF-Amp-tracks.PNG

Input Transformer

    • Input Transformer (T1 on Charlie's - T2 on this board)
      • 50:75.8 Ohms = 1 : 1.23 turns ratio
        • 9 turns primary, 11 turns on secondary

RF-Amp-T2.PNG

Output Transformer

    • Output transformer (T2 on Charlie's - T1 on this board)
      • 200:50 Ohms = 2:1 turns ratio
      • 10 turns primary (on transistor collector), 5 turns secondary (towards output)

RF-Amp-T1.PNG

LT Spice Simulation

Transformers

RF-AMP-LTSPICE XFMRS.PNG

Charlie Morris Schematics

IF AMP

  • From Charlie's notes
    • DC Operating Point = 10 mA
    • V(emitter resistor) = 1/10 Vcc = 1.2V
      • R(emitter resistor) = 1.2V/0.01A = 120 ohms
  • Beta DC = geometric mean min/max beta at operating current
    • = sqrt(100*300) = 173
  • Beta AC = gain bandwidth product divided by operating frequency
    • Assume operating frequency of 10 MHz (my IF is actually at 9 MHz)
    • = 300/10 = 30
  • VCE = 0.7V
  • V(emitter) = 1.2V
  • V(base) = V(emitter) + VCE = 1.9V
  • Assume current in biasing resistors = 10x current needed by DC beta
    • 10 mA in C-E, beta DC less = 10 mA/173 \

IF Amp 0046A.jpg

IF Amp 0046B.jpg

IF Amp 0046C.jpg

IF Amp 0047A.jpg

IF Amp 0047B.jpg

IF Amp 0047C.jpg

Video

Assembly Sheet

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