標題: Low-Power Sub-Harmonic Direct-Conversion Receiver With Tunable RF LNA and Wideband LO Generator at U-NII Bands
作者: Syu, Jin-Siang
Meng, Chinchun
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Direct-conversion receiver (DCR);low-noise amplifier (LNA);octet phase;phase shifter;sub-harmonic mixer (SHM);vertical-NPN (V-NPN)
公開日期: 1-三月-2012
摘要: A low-power tunable-band sub-harmonic direct-conversion receiver covering the whole Unlicensed National Information Infrastructure band is demonstrated using 0.18-mu m CMOS technology. The RF band is selected by tuning varactors at the loads of the two-stage low-noise amplifier, while a wideband octet-phase generator is applied at the local oscillator (LO) port. The band tuning of both an LC tank and a transformer and the design of an optimal transformer turn ratio are fully discussed in this paper. Vertical-NPN bipolar junction transistors in a standard CMOS process are used at the mixer switching core for excellent 1/f noise performance. As a result, the receiver achieves a 48/50 voltage gain and 4.5/4.8-dB noise figure with a 1/f noise corner of 70 kHz when the RF band is tuned to 5.2/5.8 GHz, respectively. The dc current consumption of the RF front-end (including the LO buffer) is 8.5 mA at a 1.8-V supply.
URI: http://hdl.handle.net/11536/16124
ISSN: 0018-9480
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 60
Issue: 3
結束頁: 555
顯示於類別:期刊論文


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