By Ville Saari
This publication offers a brand new clear out layout method and concentrates at the circuit thoughts that may be applied whilst designing continuous-time low-pass filters in sleek ultra-deep-submicron CMOS applied sciences for built-in wideband radio receivers. insurance comprises system-level matters relating to the layout and implementation of an entire single-chip radio receiver and regarding the layout and implementation of a clear out circuit as part of an entire single-chip radio receiver.
Presents a brand new filter out layout procedure, emphasizing low-voltage circuit recommendations that may be applied in smooth, ultra-deep-submicron CMOS technologies;Includes filter out circuit implementations designed as part of a single-chip radio receiver in smooth 1.2V 0.13um and 65nm CMOS;Describes layout and implementation of a continuous-time low-pass filter out for a multicarrier WCDMA base-station;Emphasizes system-level issues throughout.
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Additional resources for Continuous-Time Low-Pass Filters for Integrated Wideband Radio Receivers
The RF front-end, predominantly the LNA, can be designed to have a variable gain [34, 54, 58, 64], but it is often more feasible to realize VGAs at the baseband, especially when small gain steps are needed. The analog baseband circuit may consist of cascaded filters and VGAs, as shown in Fig. 5. Another possibility is to merge the baseband filter with the VGA, at least partially. On the basis of this discussion, it should be apparent that the system-level design has a great impact not only on the overall performance but also on the total power consumption and die area of the entire single-chip radio receiver.
IEEE Trans Circ Syst II Analog Digit Signal Process 50(3):105–117 6. 18-mm CMOS. IEEE J Solid-State Circ 40(6):1265–1277 7. Moncunill-Geniz FX, Pala`-Sch€ onw€alder P, Mas-Casals O (2005) A generic approach to the theory of superregenerative reception. IEEE Trans Circ Syst I Reg Pap 52(1):54–70 8. Tuttlebee WHW (1999) Software-defined radio: facets of a developing technology. IEEE Pers Commun 6(2):38–44 9. Mitola J (1995) The software radio architecture. IEEE Commun Mag 33(5):26–38 10. 11-based wireless mesh.
Particularly in direct-conversion and low-IF receivers, the stopband linearity of the analog baseband filter plays an important role when the rejection of out-of-channel signals before the analog-to-digital conversion is being considered. The stopband linearity requirement of the analog baseband filter can be considerably alleviated by suppressing out-of-channel interfering signals in the preceding receiver stages. As the power level of the desired in-channel signals is small, the out-of-channel linearity typically dominates in a wireless receiver.