Title :
Class-AB fT-integrator for low-distortion, high-frequency continuous-time filters
Author :
Khuntsat, P. ; Worapishet, Apisak
Author_Institution :
Dept. of Electr. & Electron. Eng., Prince of Songkla Univ., Thailand
Abstract :
A class-AB fT-integrator is proposed, utilising a fully complementary bipolar technology. The integrator has been employed for biquadratic filter design, where its performance is extensively compared to the previously designed class-A fT-integrator-based circuits. Simulation results confirm better linearity offered by the proposed circuit over its class-A predecessor. By employing a 6-GHz bipolar process, the filter achieves 130-550 MHz centre-frequency tuning range and the Q is made tuneable by co-operating an over-compensating positive current-feedback technique with an additional adjustable lossy current-cell. The dynamic range of the filter was found to be 38 dB and 53 dB for SFDR and IP3-DR, respectively.
Keywords :
Q-factor; UHF filters; bipolar analogue integrated circuits; biquadratic filters; circuit feedback; circuit tuning; continuous time filters; integrating circuits; 130 to 550 MHz; 6 GHz; IP3-DR; SFDR; adjustable lossy current-cell; biquadratic filter; centre-frequency tuning range; circuit linearity; class-AB fT-integrator; filter dynamic range; fully complementary bipolar technology; high-frequency continuous-time filters; low-distortion filters; overcompensating positive current-feedback technique; tuneable Q; Bandwidth; Circuit optimization; Degradation; Filters; Frequency; Mirrors; Output feedback; Signal design; Transfer functions; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301810
