Differentially tunable varactor with built-in common-mode rejection

Author

Magierowski, Sebastian K. ; Iniewski, Krzysztof ; Zukotynski, Stefan

Author_Institution

Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada

Volume

1

fYear

2002

fDate

4-7 Aug. 2002

Abstract

A differentially tunable MOS varactor with enhanced intrinsic common-mode noise rejection is proposed and analyzed. Using a complementary topology the C-V characteristics of two MOSFETs are arranged to sum under differential excitation and to roughly cancel under common-mode excitation. The benefits of this topology are two-fold: (a) by nature, differential tuning resists common-mode noise and (b) the new structure acts to further reduce common-mode disturbances. Simulations show the effectiveness of this approach against standard techniques. Differential tuning circuits are proposed and alternate varactor structures discussed.

Keywords

CMOS analogue integrated circuits; circuit simulation; circuit tuning; integrated circuit design; integrated circuit modelling; integrated circuit noise; network topology; varactors; voltage-controlled oscillators; MOS varactor; MOSFET C-V characteristics; VCO; common-mode excitation; complementary topology; differential excitation; differential tuning circuits; differentially tunable varactor; enhanced intrinsic common-mode noise rejection; varactor built-in common-mode rejection; Capacitance-voltage characteristics; Circuit noise; Circuit optimization; Circuit topology; MOSFETs; Noise cancellation; Noise reduction; Resists; Tunable circuits and devices; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on

Print_ISBN

0-7803-7523-8

Type

conf

DOI

10.1109/MWSCAS.2002.1187282

Filename

1187282