Download Design and Characterization of Integrated Varactors for RF by Inigo Gutierrez, Juan Meléndez, Erik Hernández PDF

By Inigo Gutierrez, Juan Meléndez, Erik Hernández

Varactors are passive semiconductor units utilized in digital circuits, as a voltage-controlled method of storing strength as a way to develop the volume of electrical cost produced. long ago, using inexpensive fabrication procedures corresponding to complementary steel oxide semiconductor (CMOS) and silicon germanium (SiGe) have been stored for built-in circuits operating in frequency levels lower than the GHz. Now, the elevated operating frequency of radio frequency built-in circuits (RF ICs) for communique units, and the rage of system-on-chip expertise, has driven the necessities of varactors to the restrict. because the frequency of RF purposes maintains to upward thrust, it truly is crucial that passive units corresponding to varactors are of optimal caliber, making this a serious layout factor.

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Extra info for Design and Characterization of Integrated Varactors for RF Applications

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2), when the number of islands is doubled, the capacitance is doubled but the resistance is reduced by half. Consequently, quality is kept almost constant. 12 Variation of the capacitance when varying the number of islands on a PN-junction varactor. 2 Variation of the tuning range and quality with the number of islands. 2 Influence of the Size of the Islands If, instead of increasing the number of islands, their length is increased but their width maintained, the depletion zone also increases. This has the same effect as increasing the number of islands.

3 Variation of the tuning range and quality with the length of the islands. 15 Variation in Q in accordance with the size of the varactor. 6 mm). 16 shows the variation in capacitance with the bias voltage. Owing to the reduction of the coupling between tracks, there is a slight reduction of capacitance with the distance between islands, but the value is so insignificant that it cannot be separated from the uncertainty corresponding to the measurement equipment. 16 Influence of the distance between islands.

2000) On the use of MOS varactors in RF VCO Journal of Solid-State Circuits, 35(6), 905–910. Andreani, P. and Mattison, S. 8 GHz CMOS VCO tuned by accumulation-mode MOS varactor. Department of Applied Electronics, Lund University, Sweden.

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