Hi, I'm looking for a copy of the following document.
"Parametric frequency divider basics. (technical note )" >From the Microwave Journal Sept 1 1989. Can anyone help? Thanks, Corby Abstract below. >>>Since the introduction of half octave bandwidth microwave frequency dividers and full octave models, parametric frequency dividers have found applications in many microwave systems. General Description The parametric frequency divider is constructed using two varactor diodes in a resonant circuit. These diodes are biased slightly forward under normal operation. The input signal capacitively is coupled into the matching network for the two diodes, where it drives both of the diodes in phase. Due to the modulation of the varactor's capacitance at the input frequency f, a subharmonic resonance is set up in the diode pair at half of the input frequency, f/2. [1] This signal appears across both of the varactor diodes, but at 180[degrees] out of phase with each other. It is possibly, by using a balun connected to both diodes, to cancel the input signal f. However, by observing the signal on one of the diodes in the time domain, it can be seen that balancing is unnecessary. This signal appears as a negative impulse train with a period of f/2, with a positive maximum at the varactor's turn-on threshold voltage of 0.7 V. An electrical schematic diagram of a typical divider is shown in Figure 1. <<<< _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
