| 摘要 |
A band-pass filter with RC circuits based on active amplification technology and having a small number of components comprises three operational amplifiers {01-03}, two RC circuits {R5/C1; R9/C2} and four feedback paths. The transmission frequency fo of this band-pass filter can be varied over a wide range by adjusting the modifiable ohmic resistances {R5; R9} and the factor Q of the filter by means of the modifiable resistance R6.
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