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.
Read Online or Download Design and Characterization of Integrated Varactors for RF Applications PDF
Similar microwaves books
Queuing idea and Telecommunications : Networks and functions presents a few basic wisdom in queuing thought, in addition to crucial analytical tools and ways to be hired to judge and layout telecommunication networks. This paintings presents tools for teletraffic research in addition to descriptions of present community applied sciences corresponding to ISDN, B-ISDN, IP-based networks, MPLS, GMPLS, NGN and native entry platforms, together with ADSL-based, Ethernet, Token Passing, and WiFi.
Optical Interconnects in destiny info middle Networks covers optical networks and the way they are often used to supply excessive bandwidth, strength effective interconnects for destiny information facilities with elevated communique bandwidth necessities. This contributed quantity provides an built-in view of the long run standards of the information facilities and serves as a reference paintings for the most complex recommendations which were proposed via significant universities and firms.
This ebook covers resonating modes inside of machine and provides insights into antenna layout, impedance and radiation styles. It discusses how higher-order modes new release and keep an eye on impression bandwidth and antenna achieve. The textual content covers new methods in antenna layout by means of research hybrid modes, H_Z and E_Z fields to be had at the same time, and research and modelling on modes with useful purposes in antenna layout.
- Terrestrial trunked radio - TETRA : a global security tool
- Road Lighting: Fundamentals, Technology and Application
- Phase Noise and Frequency Stability in Oscillators (The Cambridge RF and Microwave Engineering Series)
- Microwave Bandpass Filters for Wideband Communications
Extra info for Design and Characterization of Integrated Varactors for RF Applications
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.