| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 94 === In this thesis, both 3.5GHz band down-conversion mixer and 2.5GHz LC-tank voltage-controlled oscillator (VCO) are described. The two chips are fabricated by using the TSMC 0.35μm 2P4M process. The mixer uses switching-Gm means to achieve the higher conversion gain and lower LO power needed than standard Gilbert Cell mixer, at the same time, with built-in RF and LO BALUN of transformer type to reduce the off-chip BALUN loss of using. The output IF is also transformed to single end port by a simple PMOS current mirror load for avoiding using IF BALUN, the results of measurement by OFDM QAM signal testing are also presented for verifying the linearity as reference.
As to the LC-tank VCO, it is standard type with cross-coupled PMOS pair, inversion-mode PMOS varactors and the using of the PMOS current source and 2pF bypass capacitor to reduce the power noise and interference so as to reach to lower phase noise.
On the other hand, with the design issues of RF front end in OFDM system as described in section 1.2, this can contribute to a better understanding and reference for the performance of both mixer and VCO.
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