Digitally controlled oscillator (DCO)-based architecture for RF frequency synthesis in a deep-submicrometer CMOS Process

A novel digitally controlled oscillator (DCO)-based architecture for frequency synthesis in wireless RF applications is proposed and demonstrated. It deliberately avoids any use of an analog tuning voltage control line. Fine frequency resolution is achieved through high-speed /spl Sigma//spl Delta/...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2003-11, Vol.50 (11), p.815-828
Main Authors: Staszewski, R.B., Leipold, D., Muhammad, K., Balsara, P.T.
Format: Article
Language:English
Subjects:
Circuit optimization
Circuit synthesis
CMOS process
Digital control
Frequency synthesizers
Radio frequency
Signal processing
Signal resolution
Tuning
Voltage control
Voltage-controlled oscillators
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Summary:A novel digitally controlled oscillator (DCO)-based architecture for frequency synthesis in wireless RF applications is proposed and demonstrated. It deliberately avoids any use of an analog tuning voltage control line. Fine frequency resolution is achieved through high-speed /spl Sigma//spl Delta/ dithering. Other imperfections of analog circuits are compensated through digital means. The presented ideas enable the employment of fully-digital frequency synthesizers using sophisticated signal processing algorithms, realized in the most advanced deep-submicrometer digital CMOS processes which allow almost no analog extensions. They also promote cost-effective integration with the digital back-end onto a single silicon die. The demonstrator test chip has been fabricated in a digital 0.13-/spl mu/m CMOS process together with a DSP, which acts as a digital baseband processor with a large number of digital gates in order to investigate noise coupling. The phase noise is -112 dBc/Hz at 500-kHz offset. The close-in spurious tones are below -62 dBc, while the far-out spurs are below -80 dBc. The presented ideas have been incorporated in a commercial Bluetooth transceiver.
ISSN:1057-7130
1558-125X
DOI:10.1109/TCSII.2003.819128