Current Trends and Challenges in RFID by Cornel Turcu (Ed.)

By Cornel Turcu (Ed.)

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The parasitic capacitances may result from the capacitor formed between the gate and the channel, between gate and source/drain, and between drain/source and substrate. 1 Gate capacitances The gate, the dielectric and the channel form a capacitor. When the transistor is working in the triode region with a small voltage vDS, the channel will be of uniform depth, as shown in Fig. 4. Therefore, the gate-channel capacitance can be considered equally divided between the source and the drain, and their values are: C gs  C gd  1 WLC ox (triode region) 2 (23) When the transistor is working in the saturation region, the channel presents a tapered shape and it is pinched off at the drain end, as presented in Fig.

Since the modern integrated technology allows construction of inductors, the designer should know the advantages the inductor can add in the circuit design. This section shows how to enhance the bandwidth using the ‘shunt-peaking’ technique. It consists of adding an inductor in series with the resistor, as shown in Fig. 6. 20 Current Trends and Challenges in RFID Fig. 6. Common-source stage with RLC-load. The load impedance for this case becomes: ZL  ( R  Ls )|| 1 R  Ls  Cs ( R  Ls )Cs  1 (3) And, substituting this value in (2), one can find that: Av   gm R s  L / R   1 gm ( R  Ls )  2  ( R  Ls )Cs  1 s LC  sRC  1 (4) Observe that the inductor added a zero, which always increases the bandwidth, and also two poles.

Sedra, A. S. & Smith, K. C. , Oxford University Press, ISBN 0195323033. Lee, T. H. (2004). The Design of CMOS Radio-Frequency Integrated Circuits – 2nd Edition, Cambridge University Press, ISBN 0521835399. Coleman, C. (20040 An Introduction to Radio Frequency Engineering, Cambridge University Press, ISBN 0521834813. Gilmore, R. & Besser, L. (2003) Practical RF Circuit Design for Modern Wireless Systems – Vol. II, Artech House Publishers, ISBN 1580535224. Rogers, J. & Plett, C. (20030 Radio Frequency Integrated Circuit Design, Artech House Inc, ISBN 1607839792.

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