Title :
Single amplifier bi-quadratic filter topologies in transimpedance configuration
Author :
Chandra, Gaurav ; Tadeparthy, Preetam ; Easwaran, Prakash
Author_Institution :
Broadband Silicon Technol. Center, Texas Instruments (India) Pvt. Ltd., Bangalore, India
Abstract :
The authors propose two single amplifier low pass filter topologies achieving a second order roll-off in a transimpedance (i-to-v) configuration. Both topologies are derived with the constraint of fully differential signal processing. A transimpedance configuration finds direct application in scenarios when the input signal is in the current domain while the output needs to be a voltage. The output of a current steering digital-analog converter, and output of a down-conversion mixer, are two such examples. The transimpedance active-RC configurations presented here achieve the desired filtering with a single op-amp while eliminating redundant voltage conversion. Thus, immense advantages in terms of noise, linearity and area are obtained. To the best of the authors´ knowledge, no one has previously reported single amplifier bi-quadratic active-RC topologies in a fully differential transimpedance configuration.
Keywords :
RC circuits; biquadratic filters; low-pass filters; notch filters; operational amplifiers; active-RC filters; all-pole filters; bi-quadratic filter topologies; fully differential signal processing; fully differential transimpedance configuration filters; low pass filters; notch filters; single operational amplifier filters; Broadband amplifiers; Circuit topology; Filtering; Frequency; Impedance; Low pass filters; Operational amplifiers; Poles and zeros; Transfer functions; Voltage;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464714