A Study Of Wideband LNA And Mixer For 0.1-GHz～11-GHz CMOS RF Receiver

The rapid developed wireless communication technology is changing the daily life of every one. More wireless standards are established to cover different application scenarios, such as cellular mobile communication for WAN,802.11a/b/g for WLAN, ultra-wide-band for PAN, etc. To realize a ubiquitous communication, wireless terminals are required to switch quickly and smoothly among these networks. A circuit design for wideband RP front-end is necessary. Existing researches focus on multi-standard receiver for 2G/3G/WLAN/GPS, with frequency range from 900-MHz to 5.8-GHz. Frequency range should be extend if more standards are considered, such as up to 11-GHz if UWB is included.This paper is to study 0.1-GHz-11-GHz CMOS RF circuit design to cover the carrier frequencies of WCDMA/WLAN/OFDM-UWB multi-standard system. The research is summarized as follow:1) An inductive feedback LNA is proposed achieving a frequency range of 0.5-GHz～10.6-GHz. With an inductor in the feedback loop, input impedance matching and gain compensation at high frequency is obtained at the same time. Compared to existing wideband LNAs, this circuit has less inductors and thus, area efficient;2) A LNA followed with an active balun is realized to combine two functions of low noise amplification and single-to-differential conversion. Compared to previous active balun LNA, this circuit overcomes the influence of the input node capacitance to wideband input impedance matching;3) A combined active balun LNA with a phase imbalance correction network is proposed. Compared to previous combined active balun LNA, this circuit can realize the phase imbalance correction within a wider frequency range (0.1-GHz～11-GHz);4) A wideband Gilbert mixer is proposed. In the design, inductors are introduced at the gate and the drain of the input transistors to expand the frequency bandwidth. The mixer fulfill a down conversion function in a frequency range of 0.1-GHz～ 11-GHz;5) A folded Gilbert Mixer with an adjustable LC-R network is proposed. The operating-frequency switching and the conversion-gain compensation are obtained respectively by tuning capacitors and resistors in the network;6) Based on the LNA followed with an active balun and the wideband Gilbert Mixer, a wideband RF receiver front-end circuit is realized with 0.13-μm RF CMOS process. The measurement shows a minimum NF of 3.35 dB, a maximum gain of 24 dB and a maximum IIP3 of-5.2 dBm;7) Based on the combined active balun LNA and the folded Gilbert Mixer with LC-R network, a adjustable RF receiver front-end circuit is realized with 0.13-μm RF CMOS process. The measurement shows a minimum NF of 3.2 dB, a maximum gain of 29.6 dB and a maximum IIP3 of -4.2 dBm;...