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Based on the requirements of phase noise and frequency tuning range of the GSM system, this paper designs a voltage-controlled oscillator suitable for GSM/EDGE handset RFIC with the structure of no-tail current source and switched-capacitor array. The whole circuit uses TSMC 0.18 μm CMOS technology. The power supply is 3.3V. The simulation results show that the operating frequency covers 3296 ~ 3980...
A low phase noise CMOS LC VCO working at 1.8 GHz with quadrature prescaler for single-chip UHF 860 - 960 MHz RFID reader is proposed in this paper. The symmetrical filtration technology is adopted to suppress noise for complementary cross coupled LC VCO. FOM method is applied in low-noise VCO design. Injection locked prescaler with ring oscillator core can provide wide locking range. The proposed...
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