3.1-10.6GHz CMOS 超寬頻低雜訊放大器之設計及實現

Abstract

This thesis aim is to design an ultra wideband low noise amplifier and a voltage-controlled oscillator for 802.11a applications. Study the theme be divided into three parts： The first part is to study the improvement of inductor on silicon substrate by using trench isolation mesh to overcome the eddy current. In the second part, 3.1 ~ 10.6 GHz low noise amplifier is designed for ultra wideband (UWB). The mainly a kind of low noise amplifier was designed by resistive feedback loops and inductive peaking technique to enhance the frequency of the dominant pole and then expand 3 dB bandwidth of the LNA. The two stages amplifier is composed of a cascade and a common source. The three types of low noise amplifier are implemented in TSMC018 CMOS process, the first type is multiple inductors with multiple resistors negative feedback. The second type uses trench isolation mesh and partial pattern ground shield underneath inductors. The third type translates the output inductor into resistor. The first type of the amplifier, measured results show that the 3dB bandwidth is 10.8 GHz, the power gain (S21) of 11.4±0.4 dB, input return loss (S11) and output return loss (S22) below -8.4 dB and minimum noise figure of 4.12 dB over 3.1-10.6 GHz while consuming 22.7 mW. The second type of the amplifier measured results show the power gain (S21) of 11.15±0.65 dB, input return loss (S11) below -9.84 dB, output return loss (S22) below -7.89 dB and noise figure of 3.14~3.59 dB form 3.1 to 10.6 GHz. The total power consumption is 23.4 mW. The third type of the amplifier, measured results show the maximum power gain (S21) of 12 dB. The input return loss (S11) is less than -9.32 dB, output return loss (S22) below -4.82 dB and minimum noise figure of 4.15~4.85 dB over 3.1-10.6 GHz while consuming 29.5 mW. In the third part, we implement a 5.8GHz P-MOS only voltage-controlled oscillator in TSMC018 CMOS process. In addition, we also adopt the partial pattern ground shield (PPGS) and center pattern ground shield (CPGS) underneath the inductor to enhance the quality factor of inductor and improve the phase noise of implemented VCO.