Amplifier Design
Amplifier technical information and design software

RF Power Amplifier Design Information & Software

Information and software to aid the design of RF Power amplifiers

Background Information

  • Classes of Amplifier Operation RF amplifiers are classified A, AB, B or C according to the phase-angle (number of degrees of current flow during each 360-degree RF cycle) over which plate- or collector-current flows.

Amplifier Design Software
RF amplifier design programs you can run from the web or download and run from your hard drive:

  • Class B & C Operating Angles Class B and C RF Amplifier Operating Characteristic Curves - The efficiency of RF power amplifiers and other parameters depend on the plate current operating angle. This is the angle during which plate current flows out of a total of 360 degrees occupied by the grid-drive sine waveform ...
  • Pi-L & Pi Networks Pi-L & Pi Output Networks for RF Power Amplifiers - The network's primary function is to transform the external load resistance to a value commensurate with the amplifying device's voltage and power ratings. By putting L-phase delay = 0, so L2 = 0, the Pi-L becomes a simple Pi network ...
  • Pi-Tank RF Power Amplifier Pi-Network Output Circuit This program may be used to design the Pi-network output circuit of pentodes, tetrodes, triodes, FET and bipolar transistors. It is necessary to know only RF power output and peak voltage swing at the anode, collector or drain. For high efficiency in the amplifying device itself the peak RF voltage should be a high proportion of the DC supply volts. Anode loss is least if maximum anode current flows at the instants when anode-to-cathode voltage is at its minimum value. This means the anode load impedance should be as near as possible to a pure resistance ...
  • Tetrode RF Power Amplifiers Class A, AB & C Operation of Tetrode Single-Ended RF Amplifiers A complete RF sine waveform cycle extends over an angle of 360 degrees. The part of the cycle during which anode current flows is known as the 'operating angle.' This depends on the screen-grid-to-control-grid amplification factor, on grid DC bias, on the DC screen voltage and on the amplitude of RF grid drive volts. DC and RF anode voltages have little effect on the operating angle ...
  • Transistor RF Power Amplifiers Class-AB, Push-Pull, Broadband RF Power Amplifiers for SSB Operation Transistors designed for this class of service are available with collector dissipation ratings up to 150 watts and up to 100 volts peak voltage ratings. There is a small internal resistance in series with the emitter to provide feedback to the base circuit. This makes the amplifier more linear and helps to stabilise collector current versus temperature. If required, this program allows an additional resistor, not bypassed for RF, to be used externally ...
  • Triode RF Power Amplifiers Class A, AB & C Operation of Single-Ended Triode RF Power Amplifiers This program assists with the design and analyses the performance of triode RF power amplifiers. Cathodes are grounded. The output circuit is either a tuned tank circuit with a link coupling to a 50-ohm load, or a Pi-matching network. A Cga neutralising circuit is omitted but can be included by centre-tapping the grid tuning coil with negligible effect on other amplifier performance aspects. It is necessary to enter in this program data from tube manufacturers' sheets or characteristic curves. If users are not familiar with triode tube characteristics this program will be of educational value.

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