CMOS implementation of a 1.6 GHz low voltage low phase noise quadrature output frequency synthesizer with automatic amplitude control.

Autor: Owen Casha, Ivan Grech, Joseph Micallef, Edward Gatt
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Zdroj: Analog Integrated Circuits & Signal Processing; Apr2008, Vol. 55 Issue 1, p3-19, 17p
Abstrakt: Abstract  This article presents the design of a 1.2 V CMOS low phase noise quadrature output frequency synthesizer (FS) to be used for a GPS tuner application. Special reference is made to the design of a wide tuning range quadrature output voltage-controlled oscillator which is equipped with an automatic amplitude controller. It exhibits a phase noise response of less than −115 dBc/Hz at an offset of 1 MHz from the carrier and has a tuning range of over 36%. The effect of the automatic amplitude control is shown to improve phase noise at high oscillation frequencies and its noise has a negligible effect on the phase noise response even at low offset frequencies from the carrier. Preliminary analysis is presented showing the negligible effect of a DC–DC converter on the spurious level of the FS, included to permit the use of low sensitivity varactors. Design guidelines for reducing both the loop noise and the AM-to-PM conversion factors of the oscillator are also given. The design was made using the STMicroelectronics 0.13 μm HCMOS9-RF technology design kit. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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