Active filter with bootstrapping

Details Active filter with bootstrapping Active filter with bootstrapping

1986-10-10

1987-12-15

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330294, 330107, H03F 304, H03F 134

Patent

active

047136278

ABSTRACT:
An active low-pass filter especially suitable for inclusion in an integrated circuit and capable of operating at frequencies up to at least f.sub.T /.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.

REFERENCES:
patent: 4575650 (1986-03-01), Naimpally et al.

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