Title :
A 100MHz fifth-order low-pass gm-C filter using folded stages
Author :
Xin Jin ; Dai, Fa Foster
Author_Institution :
Dept. of Electr. & Comput. Eng., Auburn Univ., Auburn, AL, USA
Abstract :
A 100MHz fifth-order Butterworth gm-C low-pass filter using folded stages is presented. Leapfrog architecture is used to synthesize the filter. The proposed gm stage topology allows the using of telescopic operational transconductor amplifier (OTA) which generates lower noise and is more suitable for high frequency operation compared to traditional folded-cascode transconductor. Accumulation mode N-well capacitor is used as the load capacitor instead of metal-insulator-metal (MIM) capacitor to save area without sacrificing linearity. Designed in a 0.13μm CMOS process, the simulation results show the Total Harmonic Distortion (THD) is 43dB at 40MHz with 400mV Vpp input and 49dB at 10MHz with 400mV Vpp, in-band IIP3 is 21dBm, the power consumption is 11mW from a 2.2V power supply.
Keywords :
Butterworth filters; CMOS integrated circuits; MIM devices; harmonic distortion; operational amplifiers; CMOS process; MIM capacitor; OTA; THD; accumulation mode N-well capacitor; fifth-order Butterworth gm-C low-pass filter; fifth-order low-pass gm-C filter using folded stages; folded-cascode transconductor; gm stage topology; high frequency operation; leapfrog architecture; load capacitor; metal-insulator-metal capacitor; power consumption; telescopic operational transconductor amplifier; total harmonic distortion; CMOS integrated circuits; Capacitors; Prototypes; CMOS analog integrated circuits; continuous-time filters; gm-C filters;
Conference_Titel :
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4673-2419-9
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2012.6389030
