CMOS LNA and Mixer Components for 2GHz applications in 0.18-μm CMOS
نویسندگان
چکیده
This paper describes a low noise variable gain amplifier (LNA) and a mixer for a WCDMA frontend receiver based on a direct architecture in 0.18-μm CMOS. The LNA provides a 50Ω input impedance and utilizes a tuned load to provide high selectivity. The LNA achieves a maximum small signal gain of 16.8 dB and a minimum gain of 4.6 dB with good input return loss. In the high gain and the low gain modes, the NFs are 0.83 dB and 2.8 dB, respectively. The LNA's IIP3 in the high gain mode is 2.1 dBm. The mixer achieves a conversion gain of 16 dB and a double side band (DSB) NF of 13.8 dB. The mixer's IIP3 is 12.12 dBm. The achieved low noise figure, gain and overall IIP3 fulfill the specifications for a UMTS LNA and mixer design. The LNA and the mixer, respectively, consume 4 mA and 5 mA of current from a 1.8-V power supply. Key-Words: CMOS analog integrated circuits, direct conversion, WCDMA, Receiver, Front-End, UMTS
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