Document Type and Number:
Japanese Patent JPH0244416
Kind Code:
B2
Abstract:
The variable switched-capacitor filter (VSCF) comprises an input terminal (101), an output terminal (104) and first and second variable switched-capacitor filter blocks (102 and 103, resp.) each having a plurality of capacitors. In each of the filter blocks (102, 103) at least one of the filters is selected in response to a control signal for changing the filter characteristic based on the selected capacitor or capacitors. A first switch (SA) delivers during a first state a first output signal from the first variable switched-capacitor filter block (102) to the output terminal (104), and during a second state, prohibits the first output signal from reaching the output terminal (104). The function of the second switch (SB) is essentially opposite to that of the first switch (SA). The selection of at least one capacitor in the first and the second variable switched-capacitor filter block (102 and 103, resp.) is performed during the second and the first state, respectively. The VSCF accomplishes automatic line equalization without being affected by waveform distortions which result from switching the filter characteristic.
Inventors:
NAKAYAMA KENJI
Application Number:
JP11692984A
Publication Date:
October 03, 1990
Filing Date:
June 07, 1984
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H03H19/00; H04B3/14
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