| 摘要 |
An active low-pass filter especially suitable for inclusion in an integrated circuit and capable of operating at frequencies up to at least fT/ beta of transistors within the filter. A bootstrap circuit is coupled to the emitter follower to reduce the capacitive effect of the emitter follower on the passed signal and to guarantee precision pass band gain match among the filters. A plurality of active filters may be connected across the signal path to provide a selection of bandwidths. A filter is switched into and out of the signal path by selectively enabling and disabling its current source.
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