Title :
A low-distortion BiCMOS seventh-order Bessel filter operating at 2.5 V supply
Author :
Yang, Fuji ; Enz, Christian C.
Author_Institution :
Electron. Lab., Swiss Federal Inst. of Technol., Lausanne, Switzerland
fDate :
3/1/1996 12:00:00 AM
Abstract :
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 μm, 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 Vpp 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
Keywords :
BiCMOS analogue integrated circuits; band-pass filters; continuous time filters; harmonic distortion; 100 to 600 kHz; 2.5 V; active capacitor; common-mode rejection ratio; double-poly BiCMOS process; dynamic range; frequency tuning; high-gain parasitic-insensitive integrator; inband group delay; low-voltage linear transconductor; passband filter; seventh-order continuous-time Bessel filter; total harmonic distortion; BiCMOS integrated circuits; Capacitors; Cutoff frequency; Delay; Distortion measurement; Dynamic range; Nonlinear filters; Passband; Total harmonic distortion; Transconductors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
