A study on wide-band frequency synthesizer for advanced wireless communication

초록

A wide-band frequency synthesizer for advanced wireless communication including LTE(Long Term Evolution) is proposed. Inductor switching techniques and 4-bit capacitor bank are used in LC-VCO for wide frequency band, and varactor bank in LC-VCO is designed for low VCO-gain variation and uniform VCO frequency interval. Additionally, the output frequency can be selected by output-selection bits in the prescaler for choosing needed frequency. The proposed frequency synthesizer is designed by 0.18 μm CMOS process and occupies 0.21 mm 2. The simulated phase noise of VCO output is below -105dBc/Hz at 1MHz offset. The frequency synthesizer consumes 32.4 mW by 1.8V supply. ©2011 IEEE.