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A 24 GHz PHEMT-based oscillator

Lewandowski A., Kompa G., Mwema W., Wiatr W.

Journal of Telecommunications and Information Technology

2003

nr 1

15-19

We present a systematic nonlinear procedure for designing microwave oscillators utilising a nonlinear PHEMT model, the negative resistance approach and the describing function concept. The procedure is applied in the design of a 24 GHz oscillator, which is then realised in hybrid technology. Measurement results show - 6% shift in the frequency but an acceptable agreement in the output power. A detailed analysis shows that the frequency shift arises mainly from inadequate CAD models in the K band, for the microstrip components employed in our design.