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Wideband Transformer Characteristics

From North Hills Signal Processing
 

 

After deciding which of the configurations is required, major characteristics of wideband transformers are:

Input and Output Impedances
Impedances are determined by the source and load impedances to be interfaced by the transformer. Inasmuch as the transformer is essentially a loss less device, terminal voltages and impedance levels are ideally related as v (Zin/Z out).

Bandwidth
Usually defined by the high and low frequencies where the amplitude response drops 3 dB below that at mid-frequency. Bandwidth may also be defined at the high end, as that frequency where a specified value of VSWR is not exceeded. A typical specification value would be 1.25:1 (-19 dB return loss).

Insertion Loss
Usually specified at mid-band, and typically on the order of 0.2 to 0.5 dB, depending on bandwidth and center frequency.

Power Level
Maximum input that the transformer must handle without
saturation, distortion or overheating.

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