A low-distortion BiCMOS seventh-order Bessel filter operating at 2.5 V supply

This paper presents the design of a seventh-order continuous-time Bessel filter using a new low-voltage and highly linear BiCMOS transconductor. A high-gain and parasitic-insensitive integrator is obtained by using an active capacitor scheme. The filter has been designed to operate at a 2.5 V supply with a nominal -3 dB cutoff frequency of 600 kHz. It has been fabricated in 1 /spl mu/m, double-poly 6-GHz BiCMOS process. The inband group delay variation is less than 10 ns. The total harmonic distortion (THD) measured with a 100 kHz input signal is less than -49 dB for a 2 V/sub pp/ amplitude and the dynamic range is 77 dB. The filter can be frequency tuned over almost one decade with a gain variation less than 0.2 dB in the passband. A common-mode rejection ratio (CMRR) of 53 dB in the passband is observed, thanks to a careful common-mode control strategy.

[1]  J. Hanson,et al.  CMOS voltage to current transducers , 1985 .

[2]  Z. Czarnul,et al.  MOS transconductors and integrators with high linearity , 1986 .

[3]  Francois Krummenacher,et al.  A 4-MHz CMOS Continuous-Time Filter with On-Chip Automatic Tuning , 1987, ESSCIRC '87: 13th European Solid-State Circuits Conference.

[4]  E. Seevinck.  Analysis and synthesis of translinear integrated circuits , 1988 .

[5]  Eric A. Vittoz,et al.  Future of analog in the VLSI environment , 1990, IEEE International Symposium on Circuits and Systems.

[6]  Yannis Tsividis,et al.  Design considerations for high-frequency continuous-time filters and implementation of an antialiasing filter for digital video , 1990 .

[7]  Michiel Steyaert,et al.  A large-signal very low-distortion transconductor for high-frequency continuous-time filters , 1991 .

[8]  Hiroshi Tanimoto,et al.  Realization of a 1-V active filter using a linearization technique employing plurality of emitter-coupled pairs , 1991 .

[9]  Andrea Baschirotto,et al.  Tunable BiCMOS continuous-time filter for high-frequency applications , 1992 .

[10]  Bosco Leung,et al.  Impedance boosting techniques based on BiCMOS technology , 1993 .

[11]  P. R. Gray,et al.  A 20-MHz sixth-order BiCMOS parasitic-insensitive continuous-time filter and second-order equalizer optimized for disk-drive read channels , 1993 .

[12]  M. Koyama,et al.  A 2.5-V active low-pass filter using all-n-p-n Gilbert cells with a 1-V/sub p-p/ range , 1993 .

[13]  K. W. Martin,et al.  A BiCMOS low-distortion 8-MHz low-pass filter , 1993 .

[14]  A. Wyszynski,et al.  Low-voltage CMOS and BiCMOS triode transconductors and integrators with gain-enhanced linearity and output impedance , 1994 .

[15]  Andrea Baschirotto,et al.  Low-voltage balanced transconductor with high input common-mode rejection , 1994 .

[16]  Eric A. Vittoz,et al.  Low-power design: ways to approach the limits , 1994, Proceedings of IEEE International Solid-State Circuits Conference - ISSCC '94.

[17]  E. Vittoz,et al.  An analytical MOS transistor model valid in all regions of operation and dedicated to low-voltage and low-current applications , 1995 .

[18]  Andrea Baschirotto,et al.  A 3 V 12-55 MHz BiCMOS pseudo-differential continuous-time filter , 1995 .

[19]  Christian C. Enz,et al.  A new BiCMOS low-voltage and low-distortion OTA for continuous-time filters , 1995, Proceedings of ISCAS'95 - International Symposium on Circuits and Systems.