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Current Reusing VCO and Divide-by-Two Frequency Divider for Quadrature LO Generation

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6 Author(s)
Kyung-Gyu Park ; Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul ; Chan-Young Jeong ; Jae-Woo Park ; Jang-Woo Lee
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For low-power and accurate quadrature local oscillator (LO) signal generation, an LC-tank voltage controlled oscillator (VCO) operating at double the required LO-frequency reuses the bias current of divide-by-two frequency divider. The current reusing VCO and divide-by-two frequency divider are targeted to generate the LO signals for a 1.57 GHz global positioning system receiver. Implemented in a 0.18 mum CMOS technology, the current reusing VCO and divide-by-two frequency divider consumes 1.7mA from a 1.8 V supply. The measured phase noise is -120dBc/Hz at 1 MHz offset when the carrier frequency is 1.57GHz.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:18 ,  Issue: 6 )