Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-02-26
1998-04-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 333174, H03K 500, H03B 100
Patent
active
057450013
ABSTRACT:
An active filter apparatus makes it possible for a filter adjusting circuit to require a small number of elements when the filter adjusting circuit is contained in an integrated circuit, to be not easily affected by variations in the characteristics of the elements which form the circuit, and to be capable of easily adjusting the frequency characteristics of the filter to be adjusted. A characteristics conversion device converts, on the basis of an input signal and an output signal of the filter, to a characteristics conversion signal whose amplitude when the adjustment is completed is considerably larger than that of the output signal. As a result, the amplification factor of the characteristics conversion device, necessary to detect a maximum or minimum value of a characteristics conversion signal, is considerably small. Therefore, it is possible to considerably decrease an offset error of the characteristics conversion device.
REFERENCES:
patent: 3761829 (1973-09-01), Spauding
patent: 4159526 (1979-06-01), Mosley, Jr. et al.
patent: 4302738 (1981-11-01), Cabot et al.
patent: 4558282 (1985-12-01), Lowenschuss
patent: 5206606 (1993-04-01), Yamaguchi et al.
patent: 5227743 (1993-07-01), Yamamoto
patent: 5317216 (1994-05-01), Hosoya et al.
Hirose Hideki
Sato Katsunori
Takayanagi Yoshiyuki
Ueshima Jun
Callahan Timothy P.
Le Dinh
Sony Corporation
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