Multi-standard receiver for Bluetooth and WLAN applications.

摘要

This dissertation presents the multi-standard receiver architecture and the corresponding RF front-end design supporting Bluetooth and IEEE 802.11a/b WLAN standards with small form factor, low cost, and low power consumption. To maximize the level of component share in the proposed multi-standard receiver, the corresponding standards is analyzed and applied to the proposed multi-standard receiver architecture. Zero-IF architecture is chosen for IEEE 802.11a/b WLANs, and low-IF architecture for Bluetooth, respectively. The system specifications and the building block specifications is derived from the corresponding standards and verified by spreadsheet models taking into account of major design issues such as do offset, flicker noise and image-rejection. The spreadsheet simulation results prove the validity of the system analysis and the proposed multi-standard receiver architecture.; This dissertation also presents the design of the RF front-end consisting of LNAs, SDCs and downconversion I/Q mixers for multi-standard receiver mentioned above. To reduce the current consumption and the die size of the RF front-end, single-ended LNAs with dual gain are designed. For better even order linearity, the double-balanced mixer topology is chosen for the downconversion mixer. In order to make these single-ended LNAs operating along with the double-balanced mixers, the on-chip balun, which is called SDC in this dissertation, is placed between the LNA and the I/Q mixers. Additionally, by placing the SDC between the LNA and the mixers, LO-RF isolation would be much improved. The undesired bondwire and package parasitics is taken into account during the schematic design and the layout. These undesired parasitic capacitors, inductors, and resistors may affect the gain response and the input impedance matching of the LNAs, and the gain and phase mismatch of the SDCs. The proposed RF front-ends are fabricated with TSMC RF CMOS 0.18mum process and experimental data is presented. Although it shows the degradation of the gain and the input impedance to some extent, the proposed RF front-end shows high linearity, very low corner frequency of the flicker noise, negligible gain and phase mismatch, and low power dissipation for 2.4-GHz and 5.2-GHz frequency bands.