A 3 V 12-55 MHz BiCMOS pseudo-differential continuous-time filter

Author

Rezzi, Francesco ; Baschirotto, Andrea ; Castello, Rinaldo

Author_Institution

Dipartimento di Elettronica, Pavia Univ., Italy

Volume

42

Issue

11

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

896

Lastpage

903

Abstract

The reduction of the supply voltage forces one to develop system and circuit solutions able to achieve the same performance previously obtained with higher supply voltage. In this paper, a second-order low-pass continuous-time filter operating at a 3 V power supply is presented. The prototype filter is implemented using a highly linear pseudo-differential transconductor. The input common-mode signal is canceled at the transconductor level using a feed-forward path. The output common mode voltage is controlled at the filter level using lossy integrators. A prototype cell has been realized in 1.2 μm BiCMOS technology. The pole frequency can be tuned in the range 12-55 MHz. A THD of -40 dB is achieved for signals up to 1 V_pp at 10 MHz. The dynamic range is approximately 60 dB

Keywords

BiCMOS analogue integrated circuits; VHF filters; circuit tuning; continuous time filters; feedforward; low-pass filters; radiofrequency filters; 1.2 micron; 12 to 55 MHz; 3 V; BiCMOS technology; active filter; feedforward path; input common-mode signal cancellation; linear pseudo-differential transconductor; lossy integrators; output common mode voltage control; pole frequency tuning; pseudo-differential continuous-time filter; second-order low-pass filter; BiCMOS integrated circuits; Dynamic range; Feedforward systems; Frequency; Low pass filters; Nonlinear filters; Power supplies; Prototypes; Transconductors; Voltage control;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.477200

Filename

477200