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Capacitive Degeneration in LC-Tank Oscillator for DCO Fine-Frequency Tuning

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3 Author(s)
Luca Fanori ; Dipartimento di Elettronica, Laboratorio di Microelettronica, Università degli Studi di Pavia, Pavia, Italy ; Antonio Liscidini ; Rinaldo Castello

A digitally controlled oscillator (DCO) that achieves a minimum frequency quantization step of 150 Hz without any dithering is presented. The fine digital tuning is obtained through a capacitive degeneration of a portion of the transistor switching pair used in a classical LC-tank oscillator. The new tuning circuitry does not appreciably affect the intrinsic oscillator phase noise and allows to trim the frequency with a programmable resolution for calibration and multi-standard operation. A prototype integrated in 65 nm CMOS technology exhibits a phase noise of @ 1 MHz drawing 16 mA from a supply of 1.8 V, resulting in a FoM of 183 dBc/Hz. The active area is 700 450.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:45 ,  Issue: 12 )
IEEE RFIC Virtual Journal
IEEE RFID Virtual Journal