Signal interface circuit
First Claim
1. An interface unit for voltage input signals, comprisingan analog-digital converter for converting an input signal voltage into a digital output signal for a control unit;
- two or more input channels;
an analog multiplexer configured to switch the input signal of said two or more input channels alternately to said analog-digital converter;
each input channel is configurable to receive a digital or analog input signal irrespective of other input channels;
said analog-digital converter comprises an integrated sigma-delta modulator configured to generate a digitized 1-bit signal representing the voltage level of the input signal for the interpretation of the control unit irrespective of whether the signal of the input channel is digital or analog.
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Accused Products
Abstract
Interface unit for voltage input signals comprising two or more input channels. The input signals of these two or more input channels are connected alternately by an analog multiplexer to an analog-to-digital converter. The A/D converter comprises an integrated sigma-delta modulator circuit which generates a digitized 1-bit signal representing the input signal voltage level for a control unit irrespective of whether the input channel signal is digital or analog. By means of the invention all input voltage channels are made similar such that the input channels of the interface unit can receive an analog or digital signal irrespective of each other.
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Citations
9 Claims
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1. An interface unit for voltage input signals, comprising
an analog-digital converter for converting an input signal voltage into a digital output signal for a control unit; -
two or more input channels; an analog multiplexer configured to switch the input signal of said two or more input channels alternately to said analog-digital converter; each input channel is configurable to receive a digital or analog input signal irrespective of other input channels; said analog-digital converter comprises an integrated sigma-delta modulator configured to generate a digitized 1-bit signal representing the voltage level of the input signal for the interpretation of the control unit irrespective of whether the signal of the input channel is digital or analog. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification