Analog signal processing circuit
First Claim
1. An analog signal processing circuit adapted for use in an integrated circuit, said processing circuit comprising:
- an analog signal multiplexing circuit including a plurality of input current paths, an output current path, a channel select circuit responsive to a first set of coded selection signals for selecting an input current path in accordance with the code of said first set of selection signals and for coupling said selected input current path to said output current path to permit current therebetween, and first circuit means for maintaining the selected input current path at a first predetermined potential; and
a ranging circuit including an input and an output current path, said input current path of said ranging circuit being coupled to said output current path of said multiplexing circuit, a plurality of current splitters coupled in a cascaded chain having one end of said chain coupled to said input current path, each of said current splitters coupled to one and another current paths, a range select circuit responsive to a second set of coded selection signals for splitting the current of the input current path between said one and another current paths of said current splitters in a proportion as governed by the code of said second set of selection signals, and means for providing current at the output current path representative of the current through the other current paths of said current splitter, whereby the current of the input current path is ranged at the output current path in accordance with the code of the second set of selection signals.
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Abstract
An analog signal processing circuit including both an analog signal multiplexer and a ranging circuit in cascade therewith is adapted for use in an integrated circuit. The multiplexer has a plurality of input current paths and an output current path. It responds to a set of coded selection signals to couple one of the input current paths to the output current path to permit current therebetween and includes another circuit for maintaining the selected input current path at a predetermined potential, preferably ground potential. The ranging circuit has its input current path coupled to the output current path of the multiplexer and includes a plurality of current splitters coupled in a cascaded chain having one end of the chain coupled to its input current path. The ranging circuit responds to another set of coded selection signals to draw current from one and another current paths to the output current path of the multiplexer. Current representative of the current only through the other current paths of the current splitters is provided to the output current path of the ranging circuit. Accordingly, the current of the multiplexer is ranged at the output current path of the ranging circuit in accordance with the code of the selection signals of the ranging circuit.
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Citations
14 Claims
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1. An analog signal processing circuit adapted for use in an integrated circuit, said processing circuit comprising:
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an analog signal multiplexing circuit including a plurality of input current paths, an output current path, a channel select circuit responsive to a first set of coded selection signals for selecting an input current path in accordance with the code of said first set of selection signals and for coupling said selected input current path to said output current path to permit current therebetween, and first circuit means for maintaining the selected input current path at a first predetermined potential; and a ranging circuit including an input and an output current path, said input current path of said ranging circuit being coupled to said output current path of said multiplexing circuit, a plurality of current splitters coupled in a cascaded chain having one end of said chain coupled to said input current path, each of said current splitters coupled to one and another current paths, a range select circuit responsive to a second set of coded selection signals for splitting the current of the input current path between said one and another current paths of said current splitters in a proportion as governed by the code of said second set of selection signals, and means for providing current at the output current path representative of the current through the other current paths of said current splitter, whereby the current of the input current path is ranged at the output current path in accordance with the code of the second set of selection signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification