Apparatus for stabilizing cut-off frequency using a transconduct

Details Apparatus for stabilizing cut-off frequency using a transconduct Apparatus for stabilizing cut-off frequency using a transconduct

1997-07-14

1999-03-09

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330284, H03F 3191

Patent

active

058806415

ABSTRACT:
An apparatus for stabilizing cut-off frequency using a transconductance, especially used in a high-frequency filter circuit, capable of maintaining constant frequency characteristics regardless of noise in association with a clock frequency, changes in the temperature, changes in the power supply voltage and errors in fabrication, when a filter circuit is installed in an IC (Integrated Circuit). The apparatus includes a filtering unit for passing only signals having a frequency band predetermined in the IC; a transconductance setting unit, installed out of the IC, for controlling a transconductance of the filtering unit; and a controlling unit for controlling a transconductance of the transconductance setting unit.

REFERENCES:
patent: 4868519 (1989-09-01), Shafer
patent: 5321370 (1994-06-01), Yukawa
patent: 5673003 (1997-09-01), Zocher

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