Active filter circuit with reduced noise

Details Active filter circuit with reduced noise Active filter circuit with reduced noise

2006-03-07

2006-03-07

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C330S303000

Reexamination Certificate

active

07009446

ABSTRACT:
Input conversion noises of a filter circuit are reduced. The circuit has plural circuit arrangements obtained by dividing the filter circuit so as to include at least one voltage controlled current source, and at least one circuit arrangement is an amplification circuit having an amplifying function for amplifying an input signal to the filter circuit at a set amplification factor. The amplification element circuit has: a loop circuit constructed by plural intra-loop voltage controlled current sources in which mutual conductance values have a predetermined corresponding relation; and a corresponding capacitor connected to a node in the loop circuit and having a capacitance depending on the corresponding relation so as to set a potential at the node to a predetermined potential corresponding to the amplification factor, and amplification element circuit has an electric nature which is independent of the amplification factor when seeing from the input side of the filter circuit.

REFERENCES:
patent: 4823092 (1989-04-01), Pennock
patent: 5384501 (1995-01-01), Koyama et al.
patent: 5625317 (1997-04-01), Deveirman
patent: 06-120772 (1994-04-01), None
patent: 06-164314 (1994-06-01), None
patent: 11-004139 (1999-01-01), None

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