| Summary: | 碩士 === 國立中正大學 === 電機工程研究所 === 103 === A millimeter-wave Sigma-Delta receiver in 90 nm CMOS technology was designed in this thesis. The Sigma-Delta receiver consists of two variable gain amplifiers, reflection-type phase shifters, a quadrature coupler and sub-harmonic down-mixers. The variable gain amplifier was realized in transformer-cascade of quadruple amplification stages, where in the second stage the DC current steering is incorporated for gain tuning. The reflection-type phase shifter is composed of a broadside-coupled quadrature coupler and two reflective NMOS varactor loads. The sub-harmonic mixer was implemented by passive and active configurations, respectively. The measurement results show that the integrated Sigma-Delta receiver has 10.9 dB receive gain at 48GHz with 11 dB gain tuning range. The noise figure is 17 dB and the input P1dB is -28 dBm. The chip size is 1.41 × 1.83 mm2 and the power consumption is 75 mW. Finally, a circularly-polarized antenna was also designed at 48 GHz in Roger 4350B microwave substrate, where the antenna gain is 3 dBi and the axial ratio is 1.2 dB and the return loss is lower than 10 dB. The resonance bondwiring technique was used for the interconnection of the Sigma-Delta chip and the antenna.
|
|---|
