A Current-reused VCO with Degenerated RC Components

Author

Wang, Ruey-Lue ; Liu, Chien-Hsuan ; Tsai, Guo-Ruey ; Lin, Yu-Feng ; Lin, Zhi-Cheng ; Su, Yan-Kuin

Author_Institution

Nat. Kaohsiung Marine Univ., Kaohsiung

fYear

2007

fDate

20-22 Dec. 2007

Firstpage

465

Lastpage

467

Abstract

In this paper, we presents a current-reused voltage-controlled oscillator which consists of one nmos transistor and one pmos transistor. The voltage controlled oscillator (VCO) is designed for 2.45 GHz operation. The study is based on the TSMC 0.18-um CMOS processes. The degeneration source resistors are used to improve magnitude symmetry of output signals. Additional source capacitors which are parallel with source resistors are used to improve phase noise. Measurement results show -94.6 and -116 dBc/Hz at 100-kHz and 1-MHz offset, respectively, when the oscillation frequency is at 2.45 GHz. In this work, the core current is 0.35 mA from a 1.8-V supply. The tuning range is from 2.24 to 2.52 GHz under the tuning voltage between 0 to 2 V.

Keywords

MOSFET; RC circuits; capacitors; voltage-controlled oscillators; current-reused VCO; degenerated RC components; nmos transistor; pmos transistor; size 0.18 mum; source capacitors; voltage-controlled oscillator; Capacitors; Circuit optimization; Frequency; MOS devices; MOSFETs; Phase noise; Resistors; Switches; Tuning; Voltage-controlled oscillators; VCO; current-reused; degeneration source capacitor; degeneration source resistor; phase noise; tuning range;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on

Conference_Location

Tainan

Print_ISBN

978-1-4244-0637-1

Electronic_ISBN

978-1-4244-0637-1

Type

conf

DOI

10.1109/EDSSC.2007.4450163

Filename

4450163