Document Type and Number:
Japanese Patent JPH0345570
Kind Code:
B2
Abstract:
A multiplexer samples multiple analog waveform signals to provide a sequence of input signals to an active low-pass filter. The bandwidth of the filter is determined by an input RC network having series resistance and shunt capacitance elements. As the multiplexer switches state to sample a different analog signal, the resistance elements of the filter are temporarily shorted to allow the filter input signal to rapidly charge or discharge the shunt capacitance element to a steady state voltage in response to any change in input signal voltage. The resistance elements are then unshorted to permit normal low-pass filter operation. Switch means are also provided to selectively disconnect the shunt capacitance element from the network when the resistance elements are shunted, thereby selectively widening the bandwidth of the filter to pass higher frequency input signals.
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Inventors:
JEEMUSU AARU KEROTSUGU
Application Number:
JP20914886A
Publication Date:
July 11, 1991
Filing Date:
September 05, 1986
Export Citation:
Assignee:
SONY TEKTRONIX CORP
International Classes:
G06F3/05; H03H11/04; H03H11/12; H03H19/00; H03M1/12
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