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A 2.4-GHz direct-conversion receiver (DCR) is demonstrated using 0.18-µm CMOS technology. A passive mixer is used in this work to avoid the 1/ƒ noise problem. Besides, a single-to-differential transformer is also used between the low-noise amplifier (LNA) and the passive mixer to perform better isolation. In addition, vertical-NPN transistors, which can be obtained in deep-n-well CMOS process without...
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