A simple CMOS digital controlled oscillator with high resolution and linearity

Author

To, Cheuk-Him ; Chan, Cheong-Fat ; Choy, Oliver Chiu-Sing

Author_Institution

Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong

Volume

2

fYear

1998

fDate

31 May-3 Jun 1998

Firstpage

371

Abstract

This paper presents a new DCO (digital controlled oscillator) circuit which has a very simple structure with high resolution and linearity. For example, a six bit DCO only requires seventeen MOS transistors. As a result of the simple structure, the new DCO also consumes less power compared to other DCO designs. Another added feature of this new design is that the output signal can be phase-locked to an external input signal. A four bit DCO test circuit was fabricated with a 0.7 μm CMOS technology. The test circuit has a die size of 0.024 mm ² and an operating frequency range from 13 MHz to 50 MHz

Keywords

CMOS digital integrated circuits; digital phase locked loops; phase locked oscillators; voltage-controlled oscillators; 0.7 micron; 13 to 50 MHz; CMOS; die size; digital controlled oscillator; external input signal; linearity; operating frequency range; phase-locked output signal; resolution; CMOS technology; Circuit testing; Delay; Digital control; Digital-controlled oscillators; Frequency; Inverters; Linearity; MOSFETs; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on

Conference_Location

Monterey, CA

Print_ISBN

0-7803-4455-3

Type

conf

DOI

10.1109/ISCAS.1998.706951

Filename

706951