Design and Implementation of 77 GHz and 94GHz CMOS VCO
| Autor: | Ming-Yuan Chuang, 莊明源 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The purpose of this thesis is to design and implement of 77 GHz and 94 GHz CMOS VCO. The thesis can be divided into three parts: In the first part, a 77-81 GHz Voltage Controlled Oscillator (VCO) is designed for MMW system application. In order to achieve the highest values, utilizing the tunable source-degeneration technique to decrease the MOS parasitic capacitor Cgs and increase the tuning range. The simulated results show that a tuning range is 3.37 GHz (from 73.39 GHz to 76.76 GHz) without using the tunable source-degeneration technique. After using this technique, a tuning range is 5.11 GHz (from 76.54 GHz to 81.65 GHz). There is enhance for operation frequency in this condition and we further enhance the tuning range of 1.74GHz (from 73.39 GHz to 76.54 GHz), a supply voltage of 0.8 V and a supply current of 6.4 mA. The circuit delivers maximum output power of -7.84 dBm and yields a phase noise -111.35 dBc/Hz at 10 MHz frequency offset, we put bypass capacitances at the “VDD” and “VGS” term to make our circuit more stable. The second part is continuous the first chip, we design the 94 GHz VCO. The differences between the first and the second VCO are described as below: first, the oscillation frequency increases with the increase of VT1, however, the built-in MOS varactor exhibits a poor quality factor while the capacitance decrease with the increase of VT1. As a result, we replace the built-in MOS varactor with the MOSFET whose source, drain and body are shortened. The simulation results show that using MOSFET with three regions shortened under the condition of close capacitance can effectively increase the quality factor. Second, improve the structure of the current mirror can reduce the phase noise of the VCO. The power consumption of the VCO core is 8.33 mW from the 1 V power supply, the circuit delivers maximum output power of -20.94 dBm and yields a phase noise -101.92 dBc/Hz at 10 MHz frequency offset. The result of this design can be used for 94 GHz weather radar system. In the last part, we attempt to fabricate a push-push VCO for V-Band and W-Band. Utilizing the center tapped inductor technology by push-push structure to achieve two band system application and double frequency tuning range. This case also discussion the influence of V-Band and W-Band. As mentioned above, we also use tsmc 90 nm devices, it let our design operator at high frequency. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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