A novel offset compensation biquad switched-capacitor filter design

Author

Li Qiang ; Xu Ke ; Min Hao

Author_Institution

ASIC&Syst. State Key Lab., Fudan Univ., Shanghai, China

Volume

1

fYear

2003

fDate

21-24 Oct. 2003

Firstpage

643

Abstract

Based on the architecture of traditional biquad switch-capacitor (SC) filter, placing a low-frequency zero in the transfer function of the filter by the method of adding a SC integral in the feedback path of the circuit, we designed a novel biquad SC filter used in the RFID reader. The new architecture can compensate the DC offset comes from the input and the internal offset originated by the mismatch within the differential circuit of the filter. And the output offset of our design is determined by the input offset of the integrator in the feedback path. The result of simulation show the output offset of this new architecture can be controlled within 30 mv if the input offset change from 50 mv to 500 mv.

Keywords

biquadratic filters; circuit feedback; compensation; integrated circuit design; switched capacitor filters; transfer functions; 30 mV; 50 to 500 mV; DC offset compensation; RFID reader; SC integral; biquad switched capacitor filter design; circuit feedback path; differential circuit; integrated circuit design; radio frequency identification; transfer function;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC, 2003. Proceedings. 5th International Conference on

ISSN

1523-553X

Print_ISBN

0-7803-7889-X

Type

conf

DOI

10.1109/ICASIC.2003.1277631

Filename

1277631