A 2Vpp, 80-200MHz fourth-order continuous-time linear phase filter with automatic frequency tuning Conference Paper

abstract

• A 2.3V CMOS 80-200MHz 4th-order continuous-time 0.05 equiripple linear phase filter with an automatic frequency tuning system is presented. An Operational Transconductance Amplifier (OTA) based on transistors operating in triode region is used to achieve a very wide linear input range and a wide transconductance tuning range. A system that integrates common-mode feedback (CMFB), common-mode feedforward (CMFF), and adaptive-bias into one circuit is introduced. The filter is based on Gm-C biquads and the experimental results in a 0.35m process have shown a THD of less than-44dB for a 2V ppdifferential input with a single 2.3V power supply. The cutoff frequency (fc) is tunable in the range of 80-200MHz. The group delay ripple is less than 4% for frequencies up to 1.5fc. over the whole frequency tuning range. A simple automatic tuning system that adjusts the transconductance of the OTA is used to compensate the process parameter variations. 2002 Non IEEE.

authors

• Silva-Martinez, Jose

published proceedings

• European Solid-State Circuits Conference

author list (cited authors)

• Chen, M., Silva-Martinez, J., Rokhsaz, S., & Robinson, M.

complete list of authors

• Chen, M||Silva-Martinez, J||Rokhsaz, S||Robinson, M

publication date

• December 2002

published in

• European Solid-State Circuits Conference  Journal

start page

• 643

end page

• 646