This thesis deals with two kinds of RF CMOS low noise amplifiers (LNA). The low power LNA and the image-reject LNA.
The impact of gain, noise figure, and stability on RF CMOS image-reject LNA has been studied. Through this study, the fundamental properties of image-reject LNA can be understood by a simple but physical concept.
A current-reuse RF CMOS source-degenerated cascode LNA is also presented, which adopts a combination of source-degenerated NMOS inverter and Cascode topology to improve gain and noise figure, the existent and well-studied technique from the design standpoint, makes optimization of the stage easy.
A modification of the proposed architecture is also presented, which adopts internal filters to achieve the image rejection without additional image-reject filters that degrade both noise figure and power consumption. It will be a good candidate for low power implementation of CMOS RF-IC.
Both circuits¡¦ parameters except noise figures are simulated using TSMC 0.25 um RF CMOS component models. The noise models considered here include induced gate noise, thermal noise and shot noise [5]. The current-reuse source-degenerated NMOS inverter LNA noise figure is 0.7 dB, forward gain is 16 dB, and IIP3 is -15 dBm. The low power image-reject LNA noise figure is 0.7 dB, forward gain is 16 dB, IIP3 is -16 dBm, and image rejection is 20 dB at 1.6 GHz. Both LNAs operate at 2.4 GHz and consume about 6 mA under a 2.5 V voltage supply.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0806103-232307 |
| Date | 06 August 2003 |
| Creators | Kuang-Yao, Peng |
| Contributors | Tzong-Lin Wu, Huey-Ru Chuang, Tzyy-Sheng Horng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806103-232307 |
| Rights | withheld, Copyright information available at source archive |
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