On designing linearly tunable high-Q OTA-C filters with low sensitivity

Author

De Lima, Jader A. ; Alcaide, Fernando M.

Author_Institution

Dept. of Electr. Eng., Univ. Estadual Paulista, Guaratingueta, Brazil

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

This paper discusses a design approach for a high-Q low-sensitivity OTA-C biquad bandpass section. An optimal relationship is established between transconductances defining the difference β - γ in the Q-factor denominator, setting the Q-sensitivity to tuning voltages around unity. A 30-MHz filter was designed based on a 0.35μm CMOS process and V_DD=3.3V. A range of circuit simulation supports the theoretical analysis. Q-factor spans from 20.5 to 60, while ensuring filter stability along the tuning range. Although a triode-operating OTA is used, the procedure can be extended to other types on transconductor.

Keywords

CMOS integrated circuits; Q-factor; band-pass filters; biquadratic filters; circuit simulation; circuit stability; circuit tuning; operational amplifiers; sensitivity analysis; 0.35 microns; 3.3 V; 30 MHz; CMOS process; OTA-C filters; Q-factor denominator; Q-sensitivity; biquad bandpass section; circuit simulation; filter stability; high-Q filter; linearly tunable filter; low-sensitivity filter; optimal relationship; theoretical analysis; transconductor; triode-operating OTA; tuning range; Band pass filters; Capacitance; Circuit optimization; Circuit simulation; Q factor; Transconductance; Transconductors; Tunable circuits and devices; Tuning; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328121

Filename

1328121