A linear integrated LC bandpass filter with Q-enhancement

Author

Gao, Weinan ; Snelgrove, W. Martin

Author_Institution

Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada

Volume

45

Issue

5

fYear

1998

fDate

5/1/1998 12:00:00 AM

Firstpage

635

Lastpage

639

Abstract

A technique is proposed in this paper for linearizing active Q-enhanced monolithic LC filters. This technique employs capacitive dividers and tunable linear transconductors. Various multi-tanh translinear circuits can be used to implement the linear transconductors, taking into consideration the need for linear operating range and the low supply voltage. A linear Q-enhanced LC filter using the proposed technique has been implemented in a 0.5 μm bipolar process. The demonstrated filter chip operates at a center frequency around 1 GHz with the quality factor tunable up to 400 without spurious oscillation. For a Q of 40, the input intercept point and spurious-free dynamic range are -6.67 dBm and 36 dB, respectively, at a power consumption of 68 mW and with 7 dB of gain

Keywords

Q-factor; UHF filters; UHF integrated circuits; active filters; band-pass filters; bipolar analogue integrated circuits; circuit tuning; linearisation techniques; 0.5 micron; 1 GHz; 68 mW; 7 dB; LC bandpass filter; Q-enhancement; RF IC; UHF IC; active monolithic LC filters; capacitive dividers; filter chip; linear integrated filter; multi-tanh translinear circuits; submicron bipolar process; tunable linear transconductors; tunable quality factor; Band pass filters; Dynamic range; Energy consumption; Frequency; Gain; Low voltage; Nonlinear filters; Q factor; Transconductors; Tunable circuits and devices;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.673647

Filename

673647