Receiver front-end study

• Main Authors: Ruey-Jer Lin, 林睿哲
• Other Authors: Christina F. Jou
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/81286013519505841616

碩士 === 國立交通大學 === 電信工程系 === 87 === There are four parts in this paper. The first part contains the design, simulation and measurement of an X-band single-ended resistive downconverter mixer. We selected the single-ended resistive mixer structure for X-band downconverter, because it has characteristic of low distortion and low noise. In the downconverter mixer, the RF frequency is 10.9-11.4GHz, LO frequency is 10GHz, and IF frequency is 0.9-1.4GHz. Conversion loss is lower than 8dBm and minimum conversion loss is 5.5dBm which LO power is 10dBm and dc bias is -0.75V. In the second part, we discuss a X-band two-stage low noise amplifier. The low noise amplifier is used ahead of the resistive mixer. It can amplify the single from antenna. The gain of the noise amplifier is larger than 21dB and the noise is lower than 3dB in passband. In the third part, the oscillator and buffer amplifier are designed for the resistive mixer. The oscillator can generate the LO single for mixer and buffer amplifier is used to reduce the reflection from mixer. The power is 0.83dBm at 9.91GHz and the phase noise is -57.83dBm of the oscillator. The gain of buffer amplifier is about 10dB. Finally, the low-noise amplifier integrated with the mixer and antenna to achieve the receiver front-end.