Method and apparatus for AC/DC signal multiplexing
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United States of America Patent
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Jul 2, 1996
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app pub date -
Feb 24, 1995
filing date -
Feb 24, 1995
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Abstract
A method for using the same input/output pin on an integrated circuit ('IC') for both a high frequency AC signal and a DC signal simultaneously and a first circuit means to accomplish this multiplexing is disclosed. The circuit topology comprises a first and second capacitor, coupled between the AC signal input and the AC signal output. A first and second resistor are coupled to the same input/output pin as the capacitors but between the two capacitors and respectively to a DC signal input and DC signal output. The DC signal path thus lies between the two capacitors and sees them as open circuits, while the AC signal path sees the two resistors as open circuits and the capacitors as short circuits.
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