Journal
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 18, Issue 6, Pages 413-415Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2008.922674
Keywords
CMOS; current reusing; frequency divider; quadrature local oscilator (LO); voltage controlled oscillator (VCO)
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Funding
- National IT Industry Promotion Agency (NIPA), Republic of Korea [C1090-0801-0033] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과C6A1612] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 mu m CMOS technology, the current reusing VCO and divide-by-two frequency divider consumes 1.7 mA from a 1.8 V supply. The measured phase noise is - 120 dBc/Hz at 1 MHz offset when the carrier frequency is 1.57 GHz.
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