Title :
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
fDate :
11/1/1995 12:00:00 AM
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 Vpp 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;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
