Abstract
AbstractAn improved diversity receiver having a new regulator for stable power supply in a 0.18 μm CMOS technology is presented. The regulator with soft‐start is implemented to eliminate the battery damages at initial power‐up. To reduce the external components, two switches for antenna diversity are integrated in front of LNA on the chip. A stacked inductor technique is adopted to reduce the chip area. The simulation and measurement results show that the soft‐start time of the regulator can be controlled by a variable resistor from 200 μS to 6.2 mS. The front‐end (LNA and mixer) can achieve a voltage gain of 33.5 dB, a noise figure (NF) of 3.8 dB, and 23 dB of the isolation between antennas when consuming 3.9 mW with a 1.8 V power supply. The NF includes the loss of a BALUN, BPF, and switches. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 611–615, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25000
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