Abstract
In this thesis, a low noise amplifier(LNA), a receiver front-end circuit and a phase shifter in K-band (18-26.5 GHz) are discussed regarding their designs, simulations and measurements. In this frequency band, there are several important applications, such as wireless communications, automotive short range radar (SRR) and low-noise blocks(LNB). For K-band applications, a wideband 18.3-26.2GHz LNA fabricated in 0.18-um CMOS is presented. By utilizing positively coupled transformer, the gain bandwidth product can be extended. Furthermore, the transformer feedback input matching network is used to obtain wide matching bandwidth and low noise figure. In this design, the wideband LNA attains a 10.2-dB power gain, 3.9-dB noise figure, 7.9-GHz bandwidth under 10.7-mW power consumption. For K-band satellite LNB design, a 18-22 GHz receiver front-end circuit including the LNA, passive balun, mixer, and intermediate frequency(IF) amplifier is realized in a 0.18-um BiCMOS technology. The measurement results achieve 34.5-dB conversion gain, 8.8-dB noise figure, 4.2-dBm OP1dB, 14.2-dBm OIP3 under 59.4 mW power consumption. Furthermore, for applications of the automotive SRR systems, a reflection type phase shifter (RTPS) for phased-array transmitter is implemented. By utilizing the transformer resonated loads, a compact area is obtained with reduction of loss variations, and. The simulated result achieves at least 200 o phase control range. At last, a full-360o phase shifter is realized, which consists of the proposed RTPS and a tunable driving amplifier. The simulated results of the proposed phase shifter achieves a 360o phase control range, maximum 10.4-dB gain (average) and 13.5-dBm OP1dB, which is suitable for realizing a phased-array transmitter.