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Projeto de LNAs CMOS para radiofrequência usando programação geométrica.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Moreno, Chaparro Andrés, Sergio |
| Copyright Year | 2013 |
| Abstract | This dissertation proposes the design of CMOS narrowband and wideband low noise amplifiers. The design problem of narrowband LNAs is represented as an optimization problem known as geometric programming. Furthermore, a topology for wideband LNAs is designed including the geometric programming in an early stage of the design. Both type of circuits were layouted and fabricated using three different CMOS processes. The tendency to increase the number of applications for digital-intensive circuitry, is reducing and replacing the amount of analog circuits implemented on systems nowadays. In radiofrequency transceivers, most of the circuits have been replaced by a digital-intensive counterpart. Digital circuitry is preferred over the analog one due to its scalability, low PVT (Process, Voltage and Temperature) variations, and shorter designing time result of a highly automated flow. The reduction of the designing time represents a faster time-to-market and lower costs. However, the low noise amplifier is one of the radiofrequency blocks that remain mainly in the analog domain, thus reducing its designing time by optimizing an analog design flow become a good focus of study. The LNA should be capable of receiving a low power and high frequency signal and amplify it adding the minimum noise possible, while maintaining good impedance matching, low power consumption and an adequate linearity in order to avoid distortion. In this dissertation, most of the performance parameters aforementioned are formulated rigorously and described as a geometric program. Moreover, various scripts are written in order to automate the design flow. The geometric programming is considered a good option because if the optimization problem is feasible, the result is the global optimum and can be obtained in seconds. For a common source narrowband LNA, the design problem is fully formulated as a geometric program and some parameters commonly neglected, as the CMOS inductors non-idealities and the gate-drain capacitance of MOS transistor are considered. The optimization problem is solved in minutes and tested on five different CMOS processes at different operating frequencies between 1.5 GHz and 5 GHz. The results are compared and validated through simulations, and two layouts for 2.45 GHz LNAs are drawn, fabricated and tested using two different 0.18 μm processes. In addition, a noise canceling wideband LNA is formulated, and a wideband LNA-Mixer cell is designed by including the geometric programming to estimate the input impedânce matching and assure the noise cancelation. The layouts of two different prototypes of the wideband LNA-Mixer cells for the 1 GHz-5 GHz frequency band are drawn and fabricated using a 0.18 μm process. |
| File Format | PDF HTM / HTML |
| DOI | 10.11606/D.3.2013.tde-18082014-121213 |
| Alternate Webpage(s) | https://teses.usp.br/teses/disponiveis/3/3140/tde-18082014-121213/publico/dissertacao_SACMoreno.pdf |
| Alternate Webpage(s) | https://doi.org/10.11606/D.3.2013.tde-18082014-121213 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
