A Dual-Band GNSS RF Front End With a Pseudo-Differential LNA

作者：Wu, Jun^*; Jiang, Peichen; Chen, Dongpo; Zhou, Jianjun

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2011, 58(3): 134-138.

DOI：10.1109/TCSII.2011.2106352

• Dual band
• global navigation satellite systems (GNSSs)
• low-noise amplifier (LNA)
• radio-frequency (RF) front end

This brief presents the design and the implementation of a dual-band radio-frequency (RF) front end for global navigation satellite system (GNSS) receivers. The dual-band RF front end is composed of a pseudo-differential low-noise amplifier (LNA), down-conversion mixers, and programmable gain amplifiers (PGAs), and can be configured to operate at 1.2 and 1.57 GHz, respectively. The pseudo-differential LNA incorporates an active single-ended-to-differential conversion using capacitive coupling compensation for an improved phase and amplitude imbalance. The high-linearity PGA has a tunable gain range of 18 dB with a 6-dB gain step and a 0.2-dB gain ripple across a 30-MHz bandwidth. The proposed RF front end achieves a maximum voltage gain of 68/65 dB, a noise figure of 2.4/2.6 dB, and an input-referred 1-dB compression point of -42/-39 dBm at the 1.2-/1.57-GHz bands. The receiver draws 10 mA from a 1.8-V power supply. The RF front end is implemented in a 0.18-mu m CMOS process, occupying a die area of 1.0 x 0.5 mm(2).

• 出版日期2011-3
• 单位上海交通大学