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Strongly nonlinear feedback technique for significant phase noise suppression at microwave harmonic oscillators

Bánký T., Zólomy A., Berceli T.

Kwartalnik Elektroniki i Telekomunikacji

2004

Vol. 50, z. 4

567-578

Calculations are presented to study the phase noise suppression effects of an additionally introduced highly nonlinear feedback loop in microwave harmonic oscillators. Calculations are done for determining the optimal structure and parameter set of nonlinearly feedbacked harmonic oscillators, with respect to the effects of the nonlinear properties on the behavior of the phase noise characteristics. Using the calculated analytical form 6dB of phase noise suppression was achieved. Experiments have been also performed on a practical setup, specifically on an opto-electronic oscillator structure operating with high harmonic levels. Measurement and simulation results for confirming our theoretical principles are also reported.

Synthesis method for distributed amplifiers

Zólomy A.

Journal of Telecommunications and Information Technology

2003

nr 1

20-23

New design method is presented for distributed amplifiers (DA). It is shown that by proper design of the applied transmission lines (TL) between the active devices the image impedance and the cut-off frequency (COF) of the input or output line of the DA can be independently tuned. As a consequence, the phase mismatch between the lines of the DA can be adjusted independently from the termination conditions and from the capacitances of the applied transistor and thus flat gain characteristic can be achieved. The method is well applicable for nearly unilateral devices like HBTs [1] and yields the highest gain-bandwidth product.