Digitally Assisted, Fully Integrated, Wideband Transmitters for High-Speed Millimeter-Wave Wireless Communication Links by David del Rio Ainhoa Rezola Juan F. Sevillano Igone Velez & Roc Berenguer

Author:David del Rio, Ainhoa Rezola, Juan F. Sevillano, Igone Velez & Roc Berenguer
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The described custom MOM capacitors provide higher quality factors than those available in the PDK. Figure 5.5 compares both structures, for a reference capacitance value of 160 fF. As observed, Q-factors higher than 20 can be obtained at mm-wave frequencies with the described structure, whereas the PDK capacitor provides a Q-factor of around 5.

As it has been mentioned before in Sect. 5.2, when various capacitors are to be placed close to each other in the layout, forming a capacitor array, the whole resulting structure must be EM simulated to account for the coupling between the different capacitors. This effect can increase the total capacitance and it is not taken into account if each capacitor is simulated standalone [1].

Fig. 5.5Comparison of the Q-factor of a custom MOM capacitor versus the one available in PDK, for C 160 fF

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