DC-coupled wideband signal converters
First Claim
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1. A signal converter, comprising:
- a differential amplifier having first and second bias ports, first and second input ports, and a differential output port that provides differential analog signals in response to signals at the input ports;
at least one converter stage that converts said differential analog signals to digital signals;
at least one adjustable voltage source;
a string of resistors coupled to said voltage source and defining first and second tap points with said second tap point coupled to said first input port; and
a controller configured to adjust said voltage source to provide predetermined voltage and current at said first tap point, to provide first and second bias voltages to said first and second bias ports to realize amplifier common-mode levels that conform to a voltage at said second tap point, and to apply an offset correction signal to said second input port to reduce offset errors in said digital signals.
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Abstract
Signal converters are provided that accurately process dc-coupled source signals in the presence of different predetermined voltage and current source requirements. Processing structures are described that satisfy these requirements while providing accurate control of common mode levels along a processing path and accurate reduction of converter offset errors.
23 Citations
20 Claims
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1. A signal converter, comprising:
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a differential amplifier having first and second bias ports, first and second input ports, and a differential output port that provides differential analog signals in response to signals at the input ports; at least one converter stage that converts said differential analog signals to digital signals; at least one adjustable voltage source; a string of resistors coupled to said voltage source and defining first and second tap points with said second tap point coupled to said first input port; and a controller configured to adjust said voltage source to provide predetermined voltage and current at said first tap point, to provide first and second bias voltages to said first and second bias ports to realize amplifier common-mode levels that conform to a voltage at said second tap point, and to apply an offset correction signal to said second input port to reduce offset errors in said digital signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal converter, comprising:
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a differential amplifier having first and second bias ports, a first input port, and a differential output port that provides differential analog signals in response to signals at said input port; an analog-to-digital converter that converts said differential analog signals to digital signals; at least one adjustable voltage source; a string of resistors coupled to said voltage source and defining first and second tap points with said second tap point coupled to said first input port; and a controller configured to adjust said voltage source to provide predetermined voltage and current at said first tap point, and to provide first and second bias voltages to said first and second bias ports to realize amplifier common-mode levels that conform to a voltage at said second tap point. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A signal converter, comprising:
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a differential amplifier having first and second bias ports, first and second input ports, and a differential output port that provides differential analog signals in response to signals at said input ports; a converter system that converts said differential analog signals to digital signals; at least one adjustable voltage source; a string of resistors coupled to said voltage source and defining first and second tap points with said second tap point coupled to said first input port; and a controller configured to adjust said voltage source to provide predetermined voltage and current at said first tap point, to provide first and second bias voltages to said first and second bias ports to realize amplifier common-mode levels that conform to a voltage at said second tap point, and to apply an offset correction signal to said second input port to reduce offset errors in said digital signals. - View Dependent Claims (18, 19, 20)
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Specification