| Summary: | 碩士 === 國立高雄師範大學 === 電子工程學系 === 106 === Abstract
This paper mainly designs a wideband low noise amplifier circuit, and performs input matching analysis, noise analysis and gain analysis. It is developed by TSMC 0.18um CMOS process and can be used in the 2.4 GHz band of WiFi 802.11 b/g/n. In addition, an impedance converter (Regulated Cascade) was added to the front end of the LNA for research to reduce the system noise figure (Noise Figure) to improve sensitivity.
This study is divided into three parts. The first part of the study is a low noise amplifier with a bandwidth of 05 to 3 GHz, the power consumption is 16.20 mW, an input reflection loss (S11) value of -13.94 dB, and an output reflection loss (S22) value of -18.15 dB, gain (S21) value is 12.28 dB to 8.92 dB, isolation (S12) value is -34 dB, noise index value is 3.4 dB, and at 3 GHz, 1 dB gain compression point (P1dB) is - 18 dBm, third order intercept point (IIP3) is -5 dBm.
The second part of the study is a low input impedance converter. The design is based on the need to work with industry and academia and has actually designed an impedance converter. The power consumption is 20.2 mW, the real part of the input impedance is -183.71 Ω, the imaginary part of the output impedance is 67.5 Ω, the input reflection loss (S11) is -1.73 dB, and the output reflection loss (S22) is -7.16 dB. The value of (S21) is -3.52 dB.
The third part of the study is also required to match the industry-university cooperation, but the actual design of low input impedance amplifier. The real part of the input impedance is 3.63 Ω, the imaginary part of the output impedance is -3.07 Ω, the input reflection loss (S11) is -9.04 dB, the output reflection loss (S22) is -12.18 dB, and the gain (S21) is 1.48 dB. The noise index value is 4.4 dB.
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