RF Circuit Techniques for Wireless Transmitter with High Spectral Purity
| Autor: | Kun-Yao Kao, 高堃堯 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 The last two decades have witnessed a tremendous growth in wireless communications. The increasing demands for cost-effective, power-efficient, and miniature size communication devices that support multiple digital communication standards have lead more and more developments on the integration of radio-frequency (RF) transceiver circuitry. For the transmitter path design, keeping transmitted signal with high spectral purity is essential to prevent the out-of-band emission and the reduction of signal-to-noise ratio (SNR) generated from the circuit nonlinearities. This thesis describes the circuit design for the two crucial building blocks in the transmitter path, namely voltage-controlled oscillator (VCO) and power amplifier (PA). The significance of spectral purity in the transmitter path is arisen at the beginning. From a given spectrum emission mask to the required nonlinear specification for the VCO and PA is discussed. The first circuit design is a complementary transformer-coupled VCO proposed to suppress the channel thermal noise coming from the switching pair, which substantially results in lower phase noise performance and a lower oscillation noise factor compared with the existing VCO architectures. In order to analyze the nonlinear phase noise mechanism in depth, the quantitative theoretical framework will be reviewed. The second circuit design is two power amplifiers (PAs) with individual phase-delay pre-distortion linearizer proposed to further extend the output 1 dB compression point (OP1dB). The impact due to circuit nonlinearity on the third-order intermodulation distortion (IMD3) and the adjacent channel power ratio (ACPR) is discussed with separate amplitude/phase distortion issues. By means of adding a slope compensation linearizer, the power back-off operation is more efficient under complex digital modulation scheme. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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