Fast on-chip tuning circuit for active RC filters using the SAR scheme

Author

Cho, Youngjoo ; Lim, Jinup ; Jung, Kyungsoo ; Park, Jongmin ; Yang, Huikwan ; Cha, Sanghyun ; Choi, Joongho

Author_Institution

Dept. of Electr. & Comput. Eng., Seoul Univ.

fYear

2005

fDate

7-10 Aug. 2005

Firstpage

1522

Abstract

This paper presents a fast tuning scheme for active-RC filters of monolithic implementation. Due to the significant variations of passive resistor and capacitor values, it should be necessary for the filter to be equipped with the on-chip tuning circuitry. In this paper, the successive approximation register (SAR) scheme is incorporated for a prompt compensation of RC variations. The tuning time can be proportional to the number of bits in the tuning resolution scheme. The propose tuning scheme is included in implementation of the 5th-order Chebyshev-II lowpass filter, where 5-bit is used to achieve less than 2.5% cutoff frequency error with respect to RC time constant variations of plusmn40%

Keywords

Chebyshev filters; RC circuits; active filters; circuit tuning; low-pass filters; Chebyshev filter; active RC filters; capacitor values; circuit tuning; low pass filter; passive resistor; successive approximation register scheme; Capacitors; Chebyshev approximation; Circuit optimization; Filters; Frequency; Registers; Resistors; Transceivers; Tuning; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. 48th Midwest Symposium on

Conference_Location

Covington, KY

Print_ISBN

0-7803-9197-7

Type

conf

DOI

10.1109/MWSCAS.2005.1594403

Filename

1594403