Built in self-test
AssigneeAnalog Devices, Inc.
InventorsDavid Hamilton, Tom Clayton, Gordon Sharp, Ian Stevenson
Life of this patent
Estimating the term…
Abstract
A method for testing a DAC comprising controlling the DAC digitally to cause it to produce a known desired analogue output, for example a fixed amplitude sine wave; determining the duration of fixed voltage segments of the actual output of the DAC and using the duration of the fixed voltage segments to assess or determine performance of the DAC.
Claims21
A method of using a digital-to-analog converter (DAC) to generate an analog output waveform, the method comprising:
- providing an input code for controlling the DAC digitally to cause the DAC to produce a corresponding analog output;
- using a duration of fixed voltage segments determined from an actual analog output of the DAC, applying a correction to the input code of the DAC to produce a corrected input code;
- and
- controlling the DAC digitally using the corrected input code to produce the corresponding analog output.
A system to generate an analog output waveform, the system comprising:
- a digital-to-analog converter (DAC) to generate the analog output waveform using a corrected input code determined using a duration of fixed voltage segments determined from an actual analog output of the DAC to adjust an input code for controlling the DAC digitally to produce a corresponding analog output.
A system to generate an analog output waveform, the system comprising:
- a digital-to-analog converter (DAC) to generate the analog output waveform;
- a digital signal processor (DSP) circuit to control the DAC, the DSP circuit comprising:
- a digital signal input to receive an input code for controlling the DAC digitally to cause the DAC to produce a corresponding analog output;
- a time duration input to receive a duration of fixed voltage segments determined from an actual analog output of the DAC;
- and
- wherein the DSP circuit is configured to use the duration to determine and apply a correction to the input code of the DAC to produce a corrected input code to apply to the DAC to control the DAC digitally using the corrected input code to produce the corresponding analog output signal.
Dependencies are inferred from the claim text.