BROADBAND TRANSFORMER DESIGN FOR RF TRANSISTOR POWER AMPLIFIERS
Research and development technical rept.
ARMY ELECTRONICS LABS FORT MONMOUTH NJ
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Various forms of broadband transmission line transformers for use through VHF and concepts basic to their operation are summarized and described. Broadband power adding and power dividing hybrids for push-pull amplifiers and parallel additive uses are given similar attention. The design of broadband input and output matching elements for a single-ended stage using a 2N5071 transistor for 30 W of output power from 30 to 80 MHz is illustrated. Useful curves for guiding the design of 41 transformers with resistive loads are given. Curves showing typical input impedance versus frequency of a pair of cascaded 41 transformers loaded by the large signal R-L-C equivalent input circuit of the 2N5071 are included. The use of hybrids to operate a pair of these transistors in push-pull operation is described.
- Electrical and Electronic Equipment