Performance comparison of high-order IFLF and LF linear phase lowpass OTA-C filters with and without gain boost

作者：Hasan Masood ul; Sun Yichuang^*

来源：Analog Integrated Circuits and Signal Processing, 2010, 63(3): 451-463.

DOI：10.1007/s10470-009-9424-5

• Active filters
• Continuous-time filters
• OTA-C filters
• Multiple loop feedback filters
• Linear phase filters

Design and performance comparison of highorder operational transconductance amplifier and capacitor (OTA-C) filters using leapfrog (LF) and inverse-followthe- leader-feedback (IFLF) structures are investigated. The filters are designed for a 125 MHz seventh-order equiripple group delay lowpass characteristic with and without gain boost and simulated in 0.25 mu m 2-V CMOS. A fully differential highly linear OTA with cross-coupled input pairs and regulated cascode output is used for the simulation. Simulated results show that while the IFLF OTA-C filter can achieve a higher gain boost, the LF OTA-C filter has better other performances.

• 出版日期2010-6