Patent ID: 7446691
Filing Date: 2008-11-04
Classification: H03M

Abstract:
1. A multiplexer circuit comprising: an output node; an analog-to-digital converter having an input coupled to said output node and an output coupled to a microprocessor; a first resistor in series with a first signal source, said first resistor and said first signal source coupled to said output node, wherein said first signal source is configured to produce a first signal; and a second resistor in series with a second signal source, said second resistor and said second signal source coupled to said output node, wherein said second signal source is configured to produce a second signal; wherein said first resistor and said second resistor have values selected such that an output voltage at said output node is unique for each combination of said first and second signals; and wherein the first signal source is a continuous signal source the output has a plurality of bits including a set of least significant bits (LSBs) and the LSBs are allocated to the first signal source.