本論文第一部份是IEEE 802.11a WLAN接收機射頻系統之設計規劃，首先闡述相位雜訊對正交分頻多工(OFDM)訊號的影響為共模相位雜訊與載波相互干擾，並量化此影響，推得符合IEEE 802.11a規範的接收機振盪器相位雜訊的要求至少為 -95dBc/Hz@100kHz。然後，根據 802.11a 標準內訂定的射頻接收測試(靈敏度、非相鄰/相鄰頻道干擾、與最大功率輸入)與參考HIPERLAN/2的阻隔測試與贅餘響應測試，找出符合802.11a規範接收機的射頻效能參數的要求：NF<10dB，IIP3>-19dBm，IIP2>-4dBm， P1dB>-27dBm，鏡像頻率抑制>61dB，I/Q imbalance<5度，0.5dB。此外，亦對無頻率響應的IIP3串接的公式做修正，推導出有頻率響應的IIP3串接公式。論文所探討的802.11a WLAN射頻接收機之實際設計流程，可提供給射頻接收機系統規劃者與射頻電路設計者很有用的參考。
論文第二部份是選定雙降頻式超外差接收機架構，利用TSMC CMOS 0.18m的製程設計5GHz差動低雜訊放大器與雙平衡式Gilbert cell混波器，低雜訊放大器增益5.2dB，雜訊指數4.9dB，OIP3 4.9dBm，混波器轉換增益-2.2dB，OIP3 2.1dBm，LO-IF隔離度28dB。另外5GHz CMOS電流共用低雜訊放大器的設計方面，量測結果為增益11.2dB，雜訊指數4.5dB，輸入返回損耗10.5dB。

This thesis presents: (1) the study of RF system planning and receiver architecture for IEEE 802.11a WLAN OFDM system, and (2) development of 5GHz CMOS differential LNA/mixer RFICs for a double down-conversion heterodyne receiver. System planning parameters including phase noise, noise figure, IIP3, IIP2 and I/Q imbalance are derived to meet the 802.11a standard requirements. The derived RF parameters to meet 802.11a standard requirements are: phase noise <-95dBc/Hz@100kHz, NF<10dB, IIP3 >-19dBm, IIP2 >-4dBm, selectivity > 23.5, 39.5, and 59dB at offset 20, 40, and 50MHz, I/Q amplitude imbalance<0.5dB, I/Q phase imbalance<5degree, input P1dB(low gain mode) > -27dBm, and image rejection>61dB. The study will be very useful for RF circuit designers.
The 5 GHz CMOS differential LNA/mixer uses a TSMC standard 0.18m CMOS technology. The RF is from 5.725 to 5.825 GHz and the LO (and IF) frequency is a half of the RF for double down-conversion heterodyne receiver. The cascode LNA has 5.2dB gain and 4.9dB noise figure. The current reused LNA has 11.2dB gain, 4.5dB noise figure and 10.5dB input return loss. The doubly-balanced mixer has -2.2dB conversion gain, 2.1dBm OIP3 and 28dB LO-IF isolation.

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