Millimeter-Wave CMOS Low-Noise Amplifier and Frequency Synthesizer for Radar Sensor Applications

• Main Authors: Hsin-Chen Lin, 林欣晨
• Other Authors: Yo-Sheng Lin
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/41853691594727298625

碩士 === 國立暨南國際大學 === 電機工程學系 === 103 === The purpose of this thesis is to design and implement the W-band low-noise amplifiers, injection-locked frequency divider and frequency synthesizer. The thesis can be divided into four parts： In the first part, a 77~81 GHz low noise amplifier is designed for W-band system. In order to achieve the highest values, we design a three stage cascade amplifier. In the previous two stages we use a cascade circuit and the other stage we use a current source circuit which can increase the signal intensity. Then we use “T-matching” technique at both input and output term. Moreover, we add transmission line at the source of bottom NMOS to obtain flat high gain (S21), low noise figure and better “ S-parameter” performances. Finally, 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 a 92~94GHz low noise amplifier. The structure of this design is three stage cascade consisted of cascode circuit to maximum the gain. Furthermore, we put current source to improve S11 and linearity and adjust the parameter of the transmission lines to match input-output of circuit. The result of this design can be used for 94GHz weather radar system. In the third part, we use TSMC 90nm devices to design a W-band wide locking range divide-by-2 injection-locked frequency divider. In this case, we use LC-Tank to generate the signal suitable for particular frequency range. We also utilize input power matching and add “VDD” at NMOS body of the input term to up the divide range more broad. Finally, we put two stage buffer circuit at the output term to solve distortion problem and also raise output power. Moreover, we put bypass capacitances at “VDD” term again to make all circuit more stable. In the last part, we attempt to fabricate a frequency synthesizer for W-Band. This part circuits such as voltage control oscillator, injection-locked frequency divider, current mode logic, phase frequency detector, charge pump and filter used the traditional structure and tune the parameter from all block circuits to get the better values. As mentioned above, we also use tsmc 90nm devices, it let our design operator at high frequency. The effect of this circuit can applied for 76~77GHz long range and 77~81 short range automotive radar system.