Title :
Programmable floating-gate second-order sections for Gm-C filter applications
Author :
Chawla, Ravi ; Serrano, Guillermo ; Allen, Daniel ; Hasler, Paul
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
We present programmable, fully-differential Gm-C second-order sections showing tunability over a wide range of frequencies. The second-order sections use a floating-gate operational transconductance amplifier (FG-OTA) to realize tunability. We present experimental results showing frequency- and Q-tuning for a lowpass (LPSOS) and a bandpass second-order section (BPSOS) designed using these FG-OTAs. Measured 1-dB compression for LPSOS and BPSOS are -15 dBm and -11 dBm, respectively. The presented circuits are fabricated in a 0.5 μm n-well CMOS process available through MOSIS.
Keywords :
CMOS integrated circuits; continuous time filters; operational amplifiers; programmable circuits; 0.5 micron; 1 dB; BPSOS; FG-OTA; Gm-C filter; LPSOS; MOSIS; Q-tuning; bandpass second-order section; floating-gate operational transconductance amplifier; frequency-tuning; fully-differential Gm-C section; lowpass second-order section; n-well CMOS process; programmable floating-gate; tunability; Application software; Band pass filters; CMOS process; Circuits; Frequency; Operational amplifiers; Q factor; Signal processing; Transconductance; Transfer functions;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594434
