Title :
Low-voltage high-speed current-mode continuous-time IC filters with orthogonal ω0-Q tuning
Author :
Shana´A, Osama ; Schaumann, Rolf
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
fDate :
4/1/1999 12:00:00 AM
Abstract :
The design of fully differential high-frequency continuous-time current-mode filters is presented. A universal biquad is constructed from two basic building blocks, lossless and lossy differential current-mode integrators, Pole frequency ω0 and quality factor Q are tuned orthogonally by means of a translinear circuit. The design is illustrated on a 200-MHz fifth-order cascade low-pass filter. The tuning scheme is used to switch the transfer function electronically from a Butterworth to a Bessel characteristic. The proposed circuits use a single-ended supply that can be as low as 1.5 V with no special technology required. The design was implemented in an 8-GHz bipolar process
Keywords :
Butterworth filters; Q-factor; bipolar analogue integrated circuits; biquadratic filters; cascade networks; circuit tuning; continuous time filters; current-mode circuits; high-speed integrated circuits; integrating circuits; low-pass filters; low-power electronics; transfer functions; 1.5 V; 200 MHz; 8 GHz; Bessel characteristic; Butterworth characteristic; bipolar IC; design; differential integrator; fifth-order cascade low-pass filter; high-frequency circuit; low-voltage high-speed current-mode continuous-time filter; orthogonal ω0-Q tuning; pole frequency; quality factor; transfer function; translinear circuit; universal biquad; Circuit optimization; Current mode circuits; Frequency; High speed integrated circuits; Low pass filters; Q factor; Switches; Transfer functions; Tuning; Voltage;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
