| Title |
Design of a Frequency Synthesizer for UHF RFID Reader Application |
| Authors |
김경환(Kim, Kyung-Hwan) ; 오근창(Oh, Kun-Chang) ; 박종태(Park, Jong-Tae) ; 유종근(Yu, Chong-Gun) |
| Keywords |
RFID ; Reader ; UHF ; Fractional-N Frequency Synthesizer ; PLL |
| Abstract |
In this paper a Fractional-N frequency synthesizer is designed for UHF RFID readers. It satisfies the ISO/IEC frequency band(860~960MHz) and is also applicable to mobile RFID readers. A VCO is designed to operate at 1.8GHz band such that the LO pulling effect is minimized. The 900MHz differential I/Q LO signals are obtained by dividing the differential signal from an integrated 1.8GHz VCO. It is designed using a 0.18μm RF CMOS process. The measured results show that the designed circuit has a phase noise of -103dBc/Hz at 100KHz offset and consumes 9mA from a 1.8V supply. The channel switching time of 10μs over 5MHz transition have been achieved, and the chip size including PADs is 1.8×0.99mm^2. |