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US 5,689,259 AGranted
Differental D/A converter with N-bits plus sign
AssigneeExar Corporation
InventorIsmail H. Ozguc
Life of this patent
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Abstract
The present invention provides a digital-to-analog converter which uses two separate digital-to-analog converters for the first N-bits. The N+1 bit, which is the sign bit in a sign and magnitude digital format, is used to provide the difference between the two digital-to-analog converters to the output for a first value, and to switch the DAC outputs for a second value of the sign bit. The present invention thus eliminates the parasitic capacitance of the N+1 bit by using a differential input which is switched depending on the sign bit.
Claims8
A differential digital to analog converter comprising:
- a first digital to analog converter for converting n digital bits on n input lines to a first analog value on a first output;
- a second digital to analog converter for converting said n digital bits on said n input lines to a second analog value on a second output;
- and
- switching means, having a control input coupled to an n+1 digital bit input line, for switching said first and second outputs, said first and second outputs providing a differential output.
1 more element
Dependencies are inferred from the claim text.