Research Of Multimode Reconfigurable LMV For GPS/Compass/TD-LTE-A Applications

In this paper, the current reuse and device reconfiguration technology are used. Combined with satellite navigation and mobile communication technology, a multi-mode reconfigurable RF receiver front-end circuit for the GPS, Compass and TD-LTE-A is proposed, which is called LMV (LNA-Mixer-VCO). The theory of the three key modules including LNA, Mixer and VCO is analyzed. The LNA is an inductively degenerated cascode amplifier using noise optimization techniques with power constraint. Mixer is employed a single balanced structure and VCO is a differential negative resistance LC oscillator circuit. The design process of the multi-mode reconfigurable LNA and the MV block, and the estimation process of the corresponding values of device parameters are highlighted. Finally the three modules are integrated to LMV based on current and device reuse. The multi-mode reconfigurable LNA uses CMOS switches to select the input matching network and output tuning network in order to achieve the purpose of frequency selection. A three cascade structure is employed to increase the gain of the circuit; The MV module is a multiplexed differential symmetrical structure, which makes the design of device parameters more simple. The parameters for all devices can be simply obtained by analyzing one path of the module. This structure for multi-mode reconfigurable LMV has obvious advantages compared to traditional receiver, which will be widely applied in the future.The multi-mode reconfigurable LMV is designed based on SMIC0.18RF CMOS technology. The circuit schematic and layout circuit are designed by Cadence. The pre-and post-simulation are done by using Spetre RF tools. The LMV works at GPS-L1band (1575MHz, bandwidth2.046MHz), Compass B1band (1561.098MHz, bandwidth4.096MHz) and B2band (1207.14MHz, bandwidth24MHz), and D-band of the TD-LTE-A (2570MHz～2620MHz). After repeated verification, with1.8V supply voltage, the circuit gain in different operating frequencies is up to at least20dB, the noise figure is less than5dB, phase noise is less than-110dBc/Hz at1MHz offset of the center frequency. The system meets the original performance requirements.