TY - JOUR
T1 - A Radio-Frequency Tunable Active Filter
AU - Taflove, Allen
AU - Brodwin, Morris E.
PY - 1974
Y1 - 1974
N2 - A design approach for a tunable active filter of constant bandwidth and center-frequency gain is described. The approach is based on a feedback configuration with a complex pole pair in the forward transfer function, and a complex zero pair in the feedback transfer function. Center frequency tuning is achieved with the variation of only one element, a potentiomenter, which controls the feedback loop gain. A circuit realization using two commercial video amplifiers with RC embedding is presented. A tuning range of 25 percent at 5 MHz, with a nominal bandwidth of 90 kHz or 180 kHz, and a variation of center-frequency gain of less than ±1 dB over the tuning range, is obtained.
AB - A design approach for a tunable active filter of constant bandwidth and center-frequency gain is described. The approach is based on a feedback configuration with a complex pole pair in the forward transfer function, and a complex zero pair in the feedback transfer function. Center frequency tuning is achieved with the variation of only one element, a potentiomenter, which controls the feedback loop gain. A circuit realization using two commercial video amplifiers with RC embedding is presented. A tuning range of 25 percent at 5 MHz, with a nominal bandwidth of 90 kHz or 180 kHz, and a variation of center-frequency gain of less than ±1 dB over the tuning range, is obtained.
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U2 - 10.1109/JSSC.1974.1050465
DO - 10.1109/JSSC.1974.1050465
M3 - Article
AN - SCOPUS:0016050018
SN - 0018-9200
VL - 9
SP - 73
EP - 76
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 2
ER -