Abstract
Design and performance comparison of high-order operational transconductance amplifier and capacitor (OTA-C) filters using leapfrog (LF) and inverse-follow-the-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 μm 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.
Original language | English |
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Pages (from-to) | 451-463 |
Journal | Analog Integrated Circuits and Signal Processing |
Volume | 63 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2010 |
Keywords
- active filters
- continuous-time filters
- OTA-C filters
- multiple loop feedback filters
- linear phase filters